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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?

Thanks!

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If I understand it well, you look for $x,y$ such that distance of $(x,y,z_2)$ from $(x_1,y_1,z)$ is 10. So, use the Pythagorean theorem (also works for 3d): $$(x-x_1)^2 + (y-y_1)^2 + (z_2-z)^2 = 100$$ That's all you can get from these inputs.

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The Pythagorean theorem doesn´t work because i am using latiude,longitude,altitude. –  user1685439 Sep 24 '12 at 7:27
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