Finding the Fourth Proportional to 14,456.28, 19,953 and 9,411.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,456.28 : 19,953 = 9,411.72 : x
2. Step 2: Convert to fraction form
   14,456.28/19,953 = 9,411.72/x
3. Step 3: Cross multiply
   14,456.28x = 19,953 × 9,411.72
4. Step 4: Simplify right side
   14,456.28x = 187,792,049.16
5. Step 5: Solve for x
   x = 187,792,049.16/14,456.28
6. Step 6: Final answer
   x = 12,990.34