Custom formula help

Hi SF Community, 

I am having trouble trying to build a formula in an opportunity report which would calculate our total renewed %. For simple math terms, it would be (Renewal Total Contract Value at 100%) / All %s of Original Renewal Amount. Below is a screenshot of what I'm working with:

As the Renewal % field should be pulling 505,034 / 599,312. Any suggestion on how to pull this?

Thanks!

-Drew