Finding the Fourth Proportional to 12,831.34, 19,232.42 and 5,431.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,831.34 : 19,232.42 = 5,431.18 : x
2. Step 2: Convert to fraction form
   12,831.34/19,232.42 = 5,431.18/x
3. Step 3: Cross multiply
   12,831.34x = 19,232.42 × 5,431.18
4. Step 4: Simplify right side
   12,831.34x = 104,454,734.86
5. Step 5: Solve for x
   x = 104,454,734.86/12,831.34
6. Step 6: Final answer
   x = 8,140.59