Finding the Third Proportional to 54,860.50 and 81,931.75

Step by Step Solution

1. Step 1: Write the proportion equation
   54,860.50 : 81,931.75 = 81,931.75 : x
2. Step 2: Convert to fraction form
   54,860.50/81,931.75 = 81,931.75/x
3. Step 3: Cross multiply
   54,860.50x = 81,931.75 × 81,931.75
4. Step 4: Simplify right side
   54,860.50x = 6,712,811,658.06
5. Step 5: Solve for x
   x = 6,712,811,658.06/54,860.50
6. Step 6: Final answer
   x = 122,361.47