Finding the Fourth Proportional to 16,128.47, 22,256.21 and 8,957.79

Step by Step Solution

1. Step 1: Write the proportion equation
   16,128.47 : 22,256.21 = 8,957.79 : x
2. Step 2: Convert to fraction form
   16,128.47/22,256.21 = 8,957.79/x
3. Step 3: Cross multiply
   16,128.47x = 22,256.21 × 8,957.79
4. Step 4: Simplify right side
   16,128.47x = 199,366,410.59
5. Step 5: Solve for x
   x = 199,366,410.59/16,128.47
6. Step 6: Final answer
   x = 12,361.15