I need help with a b and c

1. Three forces are acting on a rigid body as shown below. F = 200 N F = 300 N 90 cm 10 cm 60 cm E =100 N (a) Is this body in equilibrium? (b) If not, what is the magnitude and direction of a fourth force which could be applied to the body in order to place the body in equilibrium? (c) Where, along the body, must this fourth force be applied