Finding the Fourth Proportional to 14,429.72, 19,912.62 and 8,142.68

Step by Step Solution

1. Step 1: Write the proportion equation
   14,429.72 : 19,912.62 = 8,142.68 : x
2. Step 2: Convert to fraction form
   14,429.72/19,912.62 = 8,142.68/x
3. Step 3: Cross multiply
   14,429.72x = 19,912.62 × 8,142.68
4. Step 4: Simplify right side
   14,429.72x = 162,142,092.62
5. Step 5: Solve for x
   x = 162,142,092.62/14,429.72
6. Step 6: Final answer
   x = 11,236.68