Question

Three forces are applied to a bracket mounted on a post as shown in fig (attached below).
Determine:
a. The magnitude and direction (angle Tx)of the resultant (R) of the three forces

b. The magnitude of two other forces Fx and Fy that would have the same resultant.

I've tried to calculate this but keep getting the wrong answer every time, I've attached the diagram below. If anyone could help, it would be really great!