Finding the Fourth Proportional to 21,124.86, 29,158.79 and 12,178.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,124.86 : 29,158.79 = 12,178.33 : x
2. Step 2: Convert to fraction form
   21,124.86/29,158.79 = 12,178.33/x
3. Step 3: Cross multiply
   21,124.86x = 29,158.79 × 12,178.33
4. Step 4: Simplify right side
   21,124.86x = 355,105,367.02
5. Step 5: Solve for x
   x = 355,105,367.02/21,124.86
6. Step 6: Final answer
   x = 16,809.83