The resultant of four forces, of which three are shown, is a couple of 480 lb·ft clockwise in sense. If each square is 1 ft on a side, determine the fourth force completely.
![diagram](./images/268-269-three-forces.png)
The resultant of four forces, of which three are shown, is a couple of 480 lb·ft clockwise in sense. If each square is 1 ft on a side, determine the fourth force completely.