Finding the Third Proportional to 639,899,977.50 and 955,656,756

Step by Step Solution

1. Step 1: Write the proportion equation
   639,899,977.50 : 955,656,756 = 955,656,756 : x
2. Step 2: Convert to fraction form
   639,899,977.50/955,656,756 = 955,656,756/x
3. Step 3: Cross multiply
   639,899,977.50x = 955,656,756 × 955,656,756
4. Step 4: Simplify right side
   639,899,977.50x = 913,279,835,288,443,520
5. Step 5: Solve for x
   x = 913,279,835,288,443,520/639,899,977.50
6. Step 6: Final answer
   x = 1,427,222,796.38