Finding the Third Proportional to 58,057.88 and 89,728.31

Step by Step Solution

1. Step 1: Write the proportion equation
   58,057.88 : 89,728.31 = 89,728.31 : x
2. Step 2: Convert to fraction form
   58,057.88/89,728.31 = 89,728.31/x
3. Step 3: Cross multiply
   58,057.88x = 89,728.31 × 89,728.31
4. Step 4: Simplify right side
   58,057.88x = 8,051,170,064.10
5. Step 5: Solve for x
   x = 8,051,170,064.10/58,057.88
6. Step 6: Final answer
   x = 138,674.90