Finding the Third Proportional to 547,065 and 865,561.50

Step by Step Solution

1. Step 1: Write the proportion equation
   547,065 : 865,561.50 = 865,561.50 : x
2. Step 2: Convert to fraction form
   547,065/865,561.50 = 865,561.50/x
3. Step 3: Cross multiply
   547,065x = 865,561.50 × 865,561.50
4. Step 4: Simplify right side
   547,065x = 749,196,710,282.25
5. Step 5: Solve for x
   x = 749,196,710,282.25/547,065
6. Step 6: Final answer
   x = 1,369,483.90