The Prudential product you described is a variable annuity, not a fixed indexed annuity.
The bonus feature is an illusion. So is the double up. The sales literature implies that your "money will double"...but the devil is in the details of the contract language.
If your goal is to have a lifetime income, based upon the Prudential formulae you described with surprising detail, you'll be OK to put a portion of your 900k in that variable annuity. That's your account value that doubles. The death benefits double. But, you will not have a cash surrender value that has tracked 7% unless the market has averaged 10%.
The total internal charges will be about 3%. So, if the market averages 7% over the next 10 years, you will have an income account based upon the 7% promise (roughly a double). However, the cash surrender value, which reflects the gross earnings minus the product charges, will only be about 4% net return.
There is an Ameritas variable annuity product, offered by fee-based financial planners, which has similar income features and guarantees as the Prudential product, but no commissions. The internal charges are much lower...but, still about 1.5% total. Not a bad idea for someone with only 100K, but you've got enough to be more diversified and get even lower expenses.
Furthermore, the principal guarantee in any variable annuity is only triggered at a particular point in time. Generally, that is 7 to 10 years from the purchase date, and happens in a very narrow window...like 30 days.
If your real concern is looking at a statement and seeing a drop in principal value (of your cash surrender value), the variable annuity won't give you the comfort you desire.
So...if the market really earns 10%, you didn't need the guarantee and will have earned 7%. If the market really earns 7%, you didn't need the guarantee and will have earned 4%. If the market tanks, you will have made a good choice and the critics (including me) will look like fools.
I haven't reviewed the prospectus of the Prudential variable annuity product line in the last 30 days, but as I recall, in order to get the guarantees, you are limited in the fund selection and manager selection to a formula that is amazingly similar to Scott's couch-tater approach.
Instead, I'd recommend you consider a ladder of fixed (CD-style) annuities that are currently yielding 5% to 6%.... and carefully selected fixed-indexed annuities without bonuses or long surrender charges for a portion of your 900K...that will earn between 3% and 10%+ . You can find all the features you need in fixed annuities with 5 to 7 year surrender charge periods. You don't need to lock in for 10 years. These products have a cash surrender value which can be guaranteed every single day after you purchase them, not just in a 30 day window in the future.
Probably 600K of the 900K into such a ladder would get you a real guarantee of income, in an amount equal to the smoke and mirrors of the variable annuity features, and the guarantee to avoid loss that you desire every single day.
The balance of the 300K could be invested, with greater peace of mind, in a balanced mutual fund, or matrix of ETF's as a true inflation hedge.