Finding the Third Proportional to 54,129.75 and 81,433.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,129.75 : 81,433.50 = 81,433.50 : x
2. Step 2: Convert to fraction form
   54,129.75/81,433.50 = 81,433.50/x
3. Step 3: Cross multiply
   54,129.75x = 81,433.50 × 81,433.50
4. Step 4: Simplify right side
   54,129.75x = 6,631,414,922.25
5. Step 5: Solve for x
   x = 6,631,414,922.25/54,129.75
6. Step 6: Final answer
   x = 122,509.62