Finding the Third Proportional to 131,410 and 287,605

Step by Step Solution

1. Step 1: Write the proportion equation
   131,410 : 287,605 = 287,605 : x
2. Step 2: Convert to fraction form
   131,410/287,605 = 287,605/x
3. Step 3: Cross multiply
   131,410x = 287,605 × 287,605
4. Step 4: Simplify right side
   131,410x = 82,716,636,025
5. Step 5: Solve for x
   x = 82,716,636,025/131,410
6. Step 6: Final answer
   x = 629,454.65