@Carl Love 

I just wanted to say thank you for helping. It works and thats all that matters. 

I can see how there probably is better ways of doing this, but I just needed something that worked, and this does.

Again thank you so much :-)

@Carl Love 

Im so sorry. I forgot to tell you V_Rdc is 153,25.

So it is basically just where where V_Ed13 crosses V_Rdc. That point on X should be 808.

I acutally dont know why X needs to be here, but that is how it is in MathCAD.