Finding the Fourth Proportional to 21,684.71, 29,921.59 and 12,249.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,684.71 : 29,921.59 = 12,249.83 : x
2. Step 2: Convert to fraction form
   21,684.71/29,921.59 = 12,249.83/x
3. Step 3: Cross multiply
   21,684.71x = 29,921.59 × 12,249.83
4. Step 4: Simplify right side
   21,684.71x = 366,534,390.83
5. Step 5: Solve for x
   x = 366,534,390.83/21,684.71
6. Step 6: Final answer
   x = 16,902.90