Finding the Fourth Proportional to 14,142.80, 21,196.42 and 12,383.62

Step by Step Solution

1. Step 1: Write the proportion equation
   14,142.80 : 21,196.42 = 12,383.62 : x
2. Step 2: Convert to fraction form
   14,142.80/21,196.42 = 12,383.62/x
3. Step 3: Cross multiply
   14,142.80x = 21,196.42 × 12,383.62
4. Step 4: Simplify right side
   14,142.80x = 262,488,326.69
5. Step 5: Solve for x
   x = 262,488,326.69/14,142.80
6. Step 6: Final answer
   x = 18,559.85