Finding the Third Proportional to 405,708,453 and 642,942,886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,708,453 : 642,942,886.50 = 642,942,886.50 : x
2. Step 2: Convert to fraction form
   405,708,453/642,942,886.50 = 642,942,886.50/x
3. Step 3: Cross multiply
   405,708,453x = 642,942,886.50 × 642,942,886.50
4. Step 4: Simplify right side
   405,708,453x = 413,375,555,300,951,872
5. Step 5: Solve for x
   x = 413,375,555,300,951,872/405,708,453
6. Step 6: Final answer
   x = 1,018,898,059.05