Finding the Third Proportional to 54,391.50 and 84,057.75

Step by Step Solution

1. Step 1: Write the proportion equation
   54,391.50 : 84,057.75 = 84,057.75 : x
2. Step 2: Convert to fraction form
   54,391.50/84,057.75 = 84,057.75/x
3. Step 3: Cross multiply
   54,391.50x = 84,057.75 × 84,057.75
4. Step 4: Simplify right side
   54,391.50x = 7,065,705,335.06
5. Step 5: Solve for x
   x = 7,065,705,335.06/54,391.50
6. Step 6: Final answer
   x = 129,904.59