Finding the Third Proportional to 561,720 and 861,349.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,720 : 861,349.50 = 861,349.50 : x
2. Step 2: Convert to fraction form
   561,720/861,349.50 = 861,349.50/x
3. Step 3: Cross multiply
   561,720x = 861,349.50 × 861,349.50
4. Step 4: Simplify right side
   561,720x = 741,922,961,150.25
5. Step 5: Solve for x
   x = 741,922,961,150.25/561,720
6. Step 6: Final answer
   x = 1,320,805.67