To indirectly measure the distance across a river, Jayden stands on one side of the river and uses sight-lines to a landmark on the opposite bank. Jayden draws the diagram below to show the lengths and angles that he measured. Find PRPR, the distance across the river. Round your answer to the nearest foot. P
R
O
C
E
120 ft
280 ft
190 ft
(Diagram is not to scale.)


\text{ ft} ft