Finding the Fourth Proportional to 5,172.52, 7,138.56 and 4,331.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172.52 : 7,138.56 = 4,331.74 : x
2. Step 2: Convert to fraction form
   5,172.52/7,138.56 = 4,331.74/x
3. Step 3: Cross multiply
   5,172.52x = 7,138.56 × 4,331.74
4. Step 4: Simplify right side
   5,172.52x = 30,922,385.89
5. Step 5: Solve for x
   x = 30,922,385.89/5,172.52
6. Step 6: Final answer
   x = 5,978.21