Finding the Third Proportional to 572,189.50 and 865,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   572,189.50 : 865,648.50 = 865,648.50 : x
2. Step 2: Convert to fraction form
   572,189.50/865,648.50 = 865,648.50/x
3. Step 3: Cross multiply
   572,189.50x = 865,648.50 × 865,648.50
4. Step 4: Simplify right side
   572,189.50x = 749,347,325,552.25
5. Step 5: Solve for x
   x = 749,347,325,552.25/572,189.50
6. Step 6: Final answer
   x = 1,309,613.91