Finding the Third Proportional to 55,728.50 and 86,387.25

Step by Step Solution

1. Step 1: Write the proportion equation
   55,728.50 : 86,387.25 = 86,387.25 : x
2. Step 2: Convert to fraction form
   55,728.50/86,387.25 = 86,387.25/x
3. Step 3: Cross multiply
   55,728.50x = 86,387.25 × 86,387.25
4. Step 4: Simplify right side
   55,728.50x = 7,462,756,962.56
5. Step 5: Solve for x
   x = 7,462,756,962.56/55,728.50
6. Step 6: Final answer
   x = 133,912.75