Finding the Fourth Proportional to 22,820.24, 31,490.76 and 13,391.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,820.24 : 31,490.76 = 13,391.12 : x
2. Step 2: Convert to fraction form
   22,820.24/31,490.76 = 13,391.12/x
3. Step 3: Cross multiply
   22,820.24x = 31,490.76 × 13,391.12
4. Step 4: Simplify right side
   22,820.24x = 421,696,546.05
5. Step 5: Solve for x
   x = 421,696,546.05/22,820.24
6. Step 6: Final answer
   x = 18,479.06