10$ pot, all-in with Nut Flushdraw and Middle Pair

IF we shove our $2.83 into the pot and lets say only Villain 2 calls and he has enough to make the call then we are given

Price to call=$2.83/ (POT+PRICE TO CALL)

$2.83/ ($4.23+2.83=$7.07)

No. That's not your equity calc for shoving. That's his equity calc for calling.
They're not the same.

Your equity calc is
(% of times he folds)*(value of the pot NOW)
+ (% of times he calls)*(% of times you win when he calls)*(value of the pot after he calls)
- (% of times he calls)*(% of times you lose when he calls)*(value of the pot after he calls)

which can be cleaned up a bit with parentheses

(% of times he folds)*(value of the pot NOW)
+ (% of times he calls)*(value of the pot after he calls)*((% of times you win when he calls) - (% of times you lose when he calls))

We can use the calculation that I used, nobodies folding both villains are all in