Finding the Third Proportional to 129,932,566.50 and 288,916,002

Step by Step Solution

1. Step 1: Write the proportion equation
   129,932,566.50 : 288,916,002 = 288,916,002 : x
2. Step 2: Convert to fraction form
   129,932,566.50/288,916,002 = 288,916,002/x
3. Step 3: Cross multiply
   129,932,566.50x = 288,916,002 × 288,916,002
4. Step 4: Simplify right side
   129,932,566.50x = 83,472,456,211,664,000
5. Step 5: Solve for x
   x = 83,472,456,211,664,000/129,932,566.50
6. Step 6: Final answer
   x = 642,429,057.32