Finding the Third Proportional to 131,406 and 287,597

Step by Step Solution

1. Step 1: Write the proportion equation
   131,406 : 287,597 = 287,597 : x
2. Step 2: Convert to fraction form
   131,406/287,597 = 287,597/x
3. Step 3: Cross multiply
   131,406x = 287,597 × 287,597
4. Step 4: Simplify right side
   131,406x = 82,712,034,409
5. Step 5: Solve for x
   x = 82,712,034,409/131,406
6. Step 6: Final answer
   x = 629,438.80