Finding the Third Proportional to 131,538 and 287,670

Step by Step Solution

1. Step 1: Write the proportion equation
   131,538 : 287,670 = 287,670 : x
2. Step 2: Convert to fraction form
   131,538/287,670 = 287,670/x
3. Step 3: Cross multiply
   131,538x = 287,670 × 287,670
4. Step 4: Simplify right side
   131,538x = 82,754,028,900
5. Step 5: Solve for x
   x = 82,754,028,900/131,538
6. Step 6: Final answer
   x = 629,126.40