Quote Originally Posted by DarthEnderX View Post
Which means if, for example, Satan has a power level of 50. Goku would have to lower his power level to 50, giving them a combined power level of 100. But then the resulting fusion is "multiplied several-fold" over that. So he'd probably have a power level somewhere between like 300-700(depending on your definition of "several"). Which, yes, is MUCH lower than Goku's starting power level, but still far higher than Satan's.
We know the Super Saiyan transformation power level multipliers, according to Toriyama:

SSJ - 50x base
SSJ2 - 2x SSJ (100x base)
SSJ3 - 4x SSJ2 (400x base)

We know Vegito in his base form was far superior to SSJ3 Goku when he fought Buu, so we can estimate fusion probably gave a power level increase of something like 5x Goku's SSJ3, or a 2000x increase from his base form (or more). Vegito then turned Super Saiyan giving another 50x (100,000x).

Super Saiyan Blue Vegito is probably somewhere along the lines of 1,000,000+ times stronger than base Goku, given how strong SSB has been shown to be. At this point the power levels are simply unfathomable, if they weren't already. I would suggest stop worrying about them and just enjoy the ride. Super has never been consistent with power levels anyway.