Finding the Third Proportional to 81,061.50 and 129,498

Step by Step Solution

1. Step 1: Write the proportion equation
   81,061.50 : 129,498 = 129,498 : x
2. Step 2: Convert to fraction form
   81,061.50/129,498 = 129,498/x
3. Step 3: Cross multiply
   81,061.50x = 129,498 × 129,498
4. Step 4: Simplify right side
   81,061.50x = 16,769,732,004
5. Step 5: Solve for x
   x = 16,769,732,004/81,061.50
6. Step 6: Final answer
   x = 206,876.66