Finding the Third Proportional to 61,216.13 and 89,728.31

Step by Step Solution

1. Step 1: Write the proportion equation
   61,216.13 : 89,728.31 = 89,728.31 : x
2. Step 2: Convert to fraction form
   61,216.13/89,728.31 = 89,728.31/x
3. Step 3: Cross multiply
   61,216.13x = 89,728.31 × 89,728.31
4. Step 4: Simplify right side
   61,216.13x = 8,051,170,064.10
5. Step 5: Solve for x
   x = 8,051,170,064.10/61,216.13
6. Step 6: Final answer
   x = 131,520.41