Finding the Third Proportional to 54,128.25 and 81,111.38

Step by Step Solution

1. Step 1: Write the proportion equation
   54,128.25 : 81,111.38 = 81,111.38 : x
2. Step 2: Convert to fraction form
   54,128.25/81,111.38 = 81,111.38/x
3. Step 3: Cross multiply
   54,128.25x = 81,111.38 × 81,111.38
4. Step 4: Simplify right side
   54,128.25x = 6,579,055,154.39
5. Step 5: Solve for x
   x = 6,579,055,154.39/54,128.25
6. Step 6: Final answer
   x = 121,545.68