Finding the Third Proportional to 131,790 and 287,442

Step by Step Solution

1. Step 1: Write the proportion equation
   131,790 : 287,442 = 287,442 : x
2. Step 2: Convert to fraction form
   131,790/287,442 = 287,442/x
3. Step 3: Cross multiply
   131,790x = 287,442 × 287,442
4. Step 4: Simplify right side
   131,790x = 82,622,903,364
5. Step 5: Solve for x
   x = 82,622,903,364/131,790
6. Step 6: Final answer
   x = 626,928.47