Finding the Fourth Proportional to 15,665.52, 21,616.92 and 8,859.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,665.52 : 21,616.92 = 8,859.18 : x
2. Step 2: Convert to fraction form
   15,665.52/21,616.92 = 8,859.18/x
3. Step 3: Cross multiply
   15,665.52x = 21,616.92 × 8,859.18
4. Step 4: Simplify right side
   15,665.52x = 191,508,185.33
5. Step 5: Solve for x
   x = 191,508,185.33/15,665.52
6. Step 6: Final answer
   x = 12,224.82