Finding the Fourth Proportional to 13,441.78, 18,557.96 and 8,663.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,441.78 : 18,557.96 = 8,663.42 : x
2. Step 2: Convert to fraction form
   13,441.78/18,557.96 = 8,663.42/x
3. Step 3: Cross multiply
   13,441.78x = 18,557.96 × 8,663.42
4. Step 4: Simplify right side
   13,441.78x = 160,775,401.82
5. Step 5: Solve for x
   x = 160,775,401.82/13,441.78
6. Step 6: Final answer
   x = 11,960.87