Finding the Fourth Proportional to 15,665.76, 21,618.78 and 8,592.24

Step by Step Solution

1. Step 1: Write the proportion equation
   15,665.76 : 21,618.78 = 8,592.24 : x
2. Step 2: Convert to fraction form
   15,665.76/21,618.78 = 8,592.24/x
3. Step 3: Cross multiply
   15,665.76x = 21,618.78 × 8,592.24
4. Step 4: Simplify right side
   15,665.76x = 185,753,746.27
5. Step 5: Solve for x
   x = 185,753,746.27/15,665.76
6. Step 6: Final answer
   x = 11,857.31