Finding the Fourth Proportional to 15,854.27, 21,879.24 and 8,781.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,854.27 : 21,879.24 = 8,781.15 : x
2. Step 2: Convert to fraction form
   15,854.27/21,879.24 = 8,781.15/x
3. Step 3: Cross multiply
   15,854.27x = 21,879.24 × 8,781.15
4. Step 4: Simplify right side
   15,854.27x = 192,124,888.33
5. Step 5: Solve for x
   x = 192,124,888.33/15,854.27
6. Step 6: Final answer
   x = 12,118.18