Finding the Third Proportional to 642,452,670 and 866,819,499

Step by Step Solution

1. Step 1: Write the proportion equation
   642,452,670 : 866,819,499 = 866,819,499 : x
2. Step 2: Convert to fraction form
   642,452,670/866,819,499 = 866,819,499/x
3. Step 3: Cross multiply
   642,452,670x = 866,819,499 × 866,819,499
4. Step 4: Simplify right side
   642,452,670x = 751,376,043,846,610,944
5. Step 5: Solve for x
   x = 751,376,043,846,610,944/642,452,670
6. Step 6: Final answer
   x = 1,169,543,032.40