Finding the Third Proportional to 636,607 and 865,099

Step by Step Solution

1. Step 1: Write the proportion equation
   636,607 : 865,099 = 865,099 : x
2. Step 2: Convert to fraction form
   636,607/865,099 = 865,099/x
3. Step 3: Cross multiply
   636,607x = 865,099 × 865,099
4. Step 4: Simplify right side
   636,607x = 748,396,279,801
5. Step 5: Solve for x
   x = 748,396,279,801/636,607
6. Step 6: Final answer
   x = 1,175,601.71