Finding the Fourth Proportional to 14,429.76, 19,909.62 and 8,142.15

Step by Step Solution

1. Step 1: Write the proportion equation
   14,429.76 : 19,909.62 = 8,142.15 : x
2. Step 2: Convert to fraction form
   14,429.76/19,909.62 = 8,142.15/x
3. Step 3: Cross multiply
   14,429.76x = 19,909.62 × 8,142.15
4. Step 4: Simplify right side
   14,429.76x = 162,107,112.48
5. Step 5: Solve for x
   x = 162,107,112.48/14,429.76
6. Step 6: Final answer
   x = 11,234.22