Finding the Fourth Proportional to 20,899.18, 31,359.56 and 13,884.04

Step by Step Solution

1. Step 1: Write the proportion equation
   20,899.18 : 31,359.56 = 13,884.04 : x
2. Step 2: Convert to fraction form
   20,899.18/31,359.56 = 13,884.04/x
3. Step 3: Cross multiply
   20,899.18x = 31,359.56 × 13,884.04
4. Step 4: Simplify right side
   20,899.18x = 435,397,385.42
5. Step 5: Solve for x
   x = 435,397,385.42/20,899.18
6. Step 6: Final answer
   x = 20,833.23