Finding the Third Proportional to 636,615 and 865,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   636,615 : 865,111.50 = 865,111.50 : x
2. Step 2: Convert to fraction form
   636,615/865,111.50 = 865,111.50/x
3. Step 3: Cross multiply
   636,615x = 865,111.50 × 865,111.50
4. Step 4: Simplify right side
   636,615x = 748,417,907,432.25
5. Step 5: Solve for x
   x = 748,417,907,432.25/636,615
6. Step 6: Final answer
   x = 1,175,620.91