That is my wall: http://imageshack.us/f/266/wall2z.png/
I know the coordinates of the lower points (left and right). (X1,Y1,Z) and (X2,Y2,Z) where X es the latitude, Y longitude and Z the altitude.
I want to know the another point of the picture. Only i know the altitude Z2 and the distance from the lower left corner. How can i get that coordinate?