Finding the Third Proportional to 636,609 and 865,102.50

Step by Step Solution

1. Step 1: Write the proportion equation
   636,609 : 865,102.50 = 865,102.50 : x
2. Step 2: Convert to fraction form
   636,609/865,102.50 = 865,102.50/x
3. Step 3: Cross multiply
   636,609x = 865,102.50 × 865,102.50
4. Step 4: Simplify right side
   636,609x = 748,402,335,506.25
5. Step 5: Solve for x
   x = 748,402,335,506.25/636,609
6. Step 6: Final answer
   x = 1,175,607.53