Finding the Third Proportional to 129,528 and 278,737.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,528 : 278,737.50 = 278,737.50 : x
2. Step 2: Convert to fraction form
   129,528/278,737.50 = 278,737.50/x
3. Step 3: Cross multiply
   129,528x = 278,737.50 × 278,737.50
4. Step 4: Simplify right side
   129,528x = 77,694,593,906.25
5. Step 5: Solve for x
   x = 77,694,593,906.25/129,528
6. Step 6: Final answer
   x = 599,828.56