Trying to calculate compound interest in my aggregation query.

I have created this array of weekly return factors, and assuming a starting value of $100

{

"investThis": 100,

"wklyReturns" : [ 0.953268776798189, 1.00703473704638, 0.994451681381773, 1.05357596706145, 0.99028490888956, 0.981037037037037, 1.01519025417356, 0.990515443440262, 1.01512249218671, 1.01603072983355, 0.991167064317986, 0.919182492650833, 0.991854491599945, 0.971319397617442, ... ]

}

All need to do is multiply "investThis" by index 0 return factor, then reuse the result and multiply that by index 0 1 return factor, all the way down the weeklyReturns list.

Here are a couple screenshots from google sheet calculation...

start drag and drop

final result

Any help is greatly appreciated