Finding the Fourth Proportional to 21,093.92, 29,110.69 and 12,142.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.92 : 29,110.69 = 12,142.71 : x
2. Step 2: Convert to fraction form
   21,093.92/29,110.69 = 12,142.71/x
3. Step 3: Cross multiply
   21,093.92x = 29,110.69 × 12,142.71
4. Step 4: Simplify right side
   21,093.92x = 353,482,681.75
5. Step 5: Solve for x
   x = 353,482,681.75/21,093.92
6. Step 6: Final answer
   x = 16,757.56