Finding the Fourth Proportional to 21,616.85, 29,831.71 and 12,185.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,616.85 : 29,831.71 = 12,185.41 : x
2. Step 2: Convert to fraction form
   21,616.85/29,831.71 = 12,185.41/x
3. Step 3: Cross multiply
   21,616.85x = 29,831.71 × 12,185.41
4. Step 4: Simplify right side
   21,616.85x = 363,511,407.27
5. Step 5: Solve for x
   x = 363,511,407.27/21,616.85
6. Step 6: Final answer
   x = 16,816.12