Finding the Fourth Proportional to 7,123.55, 9,831.17 and 4,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.55 : 9,831.17 = 4,140.72 : x
2. Step 2: Convert to fraction form
   7,123.55/9,831.17 = 4,140.72/x
3. Step 3: Cross multiply
   7,123.55x = 9,831.17 × 4,140.72
4. Step 4: Simplify right side
   7,123.55x = 40,708,132.59
5. Step 5: Solve for x
   x = 40,708,132.59/7,123.55
6. Step 6: Final answer
   x = 5,714.59