Finding the Fourth Proportional to 21,661.50, 29,892.87 and 12,229.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,661.50 : 29,892.87 = 12,229.86 : x
2. Step 2: Convert to fraction form
   21,661.50/29,892.87 = 12,229.86/x
3. Step 3: Cross multiply
   21,661.50x = 29,892.87 × 12,229.86
4. Step 4: Simplify right side
   21,661.50x = 365,585,615.10
5. Step 5: Solve for x
   x = 365,585,615.10/21,661.50
6. Step 6: Final answer
   x = 16,877.21