Finding the Third Proportional to 636,611 and 865,105

Step by Step Solution

1. Step 1: Write the proportion equation
   636,611 : 865,105 = 865,105 : x
2. Step 2: Convert to fraction form
   636,611/865,105 = 865,105/x
3. Step 3: Cross multiply
   636,611x = 865,105 × 865,105
4. Step 4: Simplify right side
   636,611x = 748,406,661,025
5. Step 5: Solve for x
   x = 748,406,661,025/636,611
6. Step 6: Final answer
   x = 1,175,610.63