Finding the Third Proportional to 54,608.50 and 81,831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,608.50 : 81,831.50 = 81,831.50 : x
2. Step 2: Convert to fraction form
   54,608.50/81,831.50 = 81,831.50/x
3. Step 3: Cross multiply
   54,608.50x = 81,831.50 × 81,831.50
4. Step 4: Simplify right side
   54,608.50x = 6,696,394,392.25
5. Step 5: Solve for x
   x = 6,696,394,392.25/54,608.50
6. Step 6: Final answer
   x = 122,625.50