Finding the Fourth Proportional to 22,831.40, 31,499.94 and 13,402.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,831.40 : 31,499.94 = 13,402.28 : x
2. Step 2: Convert to fraction form
   22,831.40/31,499.94 = 13,402.28/x
3. Step 3: Cross multiply
   22,831.40x = 31,499.94 × 13,402.28
4. Step 4: Simplify right side
   22,831.40x = 422,171,015.86
5. Step 5: Solve for x
   x = 422,171,015.86/22,831.40
6. Step 6: Final answer
   x = 18,490.81