Finding the Third Proportional to 129,932,555 and 288,915,980

Step by Step Solution

1. Step 1: Write the proportion equation
   129,932,555 : 288,915,980 = 288,915,980 : x
2. Step 2: Convert to fraction form
   129,932,555/288,915,980 = 288,915,980/x
3. Step 3: Cross multiply
   129,932,555x = 288,915,980 × 288,915,980
4. Step 4: Simplify right side
   129,932,555x = 83,472,443,499,360,400
5. Step 5: Solve for x
   x = 83,472,443,499,360,400/129,932,555
6. Step 6: Final answer
   x = 642,429,016.34