Finding the Fourth Proportional to 72,025.95, 99,401.31 and 39,766.79

Step by Step Solution

1. Step 1: Write the proportion equation
   72,025.95 : 99,401.31 = 39,766.79 : x
2. Step 2: Convert to fraction form
   72,025.95/99,401.31 = 39,766.79/x
3. Step 3: Cross multiply
   72,025.95x = 99,401.31 × 39,766.79
4. Step 4: Simplify right side
   72,025.95x = 3,952,871,020.49
5. Step 5: Solve for x
   x = 3,952,871,020.49/72,025.95
6. Step 6: Final answer
   x = 54,881.21