Finding the Fourth Proportional to 22,521.89, 31,078.86 and 12,449.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,521.89 : 31,078.86 = 12,449.72 : x
2. Step 2: Convert to fraction form
   22,521.89/31,078.86 = 12,449.72/x
3. Step 3: Cross multiply
   22,521.89x = 31,078.86 × 12,449.72
4. Step 4: Simplify right side
   22,521.89x = 386,923,104.92
5. Step 5: Solve for x
   x = 386,923,104.92/22,521.89
6. Step 6: Final answer
   x = 17,179.87