Finding the Third Proportional to 397,133,647.31 and 865,773,694.69

Step by Step Solution

1. Step 1: Write the proportion equation
   397,133,647.31 : 865,773,694.69 = 865,773,694.69 : x
2. Step 2: Convert to fraction form
   397,133,647.31/865,773,694.69 = 865,773,694.69/x
3. Step 3: Cross multiply
   397,133,647.31x = 865,773,694.69 × 865,773,694.69
4. Step 4: Simplify right side
   397,133,647.31x = 749,564,090,412,844,416
5. Step 5: Solve for x
   x = 749,564,090,412,844,416/397,133,647.31
6. Step 6: Final answer
   x = 1,887,435,364.61