Finding the Fourth Proportional to 52,139.85, 71,925.25 and 31,728.15

Step by Step Solution

1. Step 1: Write the proportion equation
   52,139.85 : 71,925.25 = 31,728.15 : x
2. Step 2: Convert to fraction form
   52,139.85/71,925.25 = 31,728.15/x
3. Step 3: Cross multiply
   52,139.85x = 71,925.25 × 31,728.15
4. Step 4: Simplify right side
   52,139.85x = 2,282,055,120.79
5. Step 5: Solve for x
   x = 2,282,055,120.79/52,139.85
6. Step 6: Final answer
   x = 43,767.96