Finding the Fourth Proportional to 4,025.50, 5,557.35 and 3,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   4,025.50 : 5,557.35 = 3,139.18 : x
2. Step 2: Convert to fraction form
   4,025.50/5,557.35 = 3,139.18/x
3. Step 3: Cross multiply
   4,025.50x = 5,557.35 × 3,139.18
4. Step 4: Simplify right side
   4,025.50x = 17,445,521.97
5. Step 5: Solve for x
   x = 17,445,521.97/4,025.50
6. Step 6: Final answer
   x = 4,333.75