Finding the Third Proportional to 636,839 and 865,344.50

Step by Step Solution

1. Step 1: Write the proportion equation
   636,839 : 865,344.50 = 865,344.50 : x
2. Step 2: Convert to fraction form
   636,839/865,344.50 = 865,344.50/x
3. Step 3: Cross multiply
   636,839x = 865,344.50 × 865,344.50
4. Step 4: Simplify right side
   636,839x = 748,821,103,680.25
5. Step 5: Solve for x
   x = 748,821,103,680.25/636,839
6. Step 6: Final answer
   x = 1,175,840.52