Remark
The 29o angle is made up of a line that looks horizontal and the hypotenuse.
The only way to solve this is to assume the horizontal line just mentioned and x are parallel. If that is so, the angle of the triangle on your right is 29o as well.
Step One
Set up the equation.
You are using a right angle triangle using the 29o angle on the lower right that we defined in the remark section.
Cos(29) = adjacent / hypotenuse.
Adjacent = x
Hypotenuse = 500
Cos(29) = 0.8746
0.8746 = x / 500 Multiply both sides by 500
x = 0.8746 * 500
x = 437.3