SOLUTION: http://prntscr.com/aa3tc4 I keep tying to solve by setting up proportions (which our teacher wants us to do using the side-splitter-theorem), but I keep getting the wrong answer.

Question 1022876: http://prntscr.com/aa3tc4
I keep tying to solve by setting up proportions (which our teacher wants us to do using the side-splitter-theorem), but I keep getting the wrong answer.
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Number 9 Exercise:

Let the question-marked length be x.

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