Finding magnitude & direction in equillibrium

[haleyscavone]

An object in equilibrium has three forces exerted on it. A 28-N force acts at 90°, and a 65-N force acts at 60°. What is the magnitude and direction of the third force?

I HAVE NO IDEA HOW TO DO THIS...
PLEASE HELP!

 

[Gear300]

If the object is in equilibrium, its not accelerating in any of the referred/assumed directions. The net force should sum to 0N in all such directions.

 

[haleyscavone]

If the object is in equilibrium, its not accelerating in any of the referred/assumed directions. The net force should sum to 0N in all such directions.

thank you so much!
that was exactly what I needed to know