Finding the Fourth Proportional to 14,417.15, 19,892.27 and 8,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   14,417.15 : 19,892.27 = 8,128.31 : x
2. Step 2: Convert to fraction form
   14,417.15/19,892.27 = 8,128.31/x
3. Step 3: Cross multiply
   14,417.15x = 19,892.27 × 8,128.31
4. Step 4: Simplify right side
   14,417.15x = 161,690,496.52
5. Step 5: Solve for x
   x = 161,690,496.52/14,417.15
6. Step 6: Final answer
   x = 11,215.15