Finding the Fourth Proportional to 15,665.22, 21,617.94 and 8,592.09

Step by Step Solution

1. Step 1: Write the proportion equation
   15,665.22 : 21,617.94 = 8,592.09 : x
2. Step 2: Convert to fraction form
   15,665.22/21,617.94 = 8,592.09/x
3. Step 3: Cross multiply
   15,665.22x = 21,617.94 × 8,592.09
4. Step 4: Simplify right side
   15,665.22x = 185,743,286.09
5. Step 5: Solve for x
   x = 185,743,286.09/15,665.22
6. Step 6: Final answer
   x = 11,857.05