Finding the Fourth Proportional to 13,143.82, 18,134.12 and 8,669.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,143.82 : 18,134.12 = 8,669.78 : x
2. Step 2: Convert to fraction form
   13,143.82/18,134.12 = 8,669.78/x
3. Step 3: Cross multiply
   13,143.82x = 18,134.12 × 8,669.78
4. Step 4: Simplify right side
   13,143.82x = 157,218,830.89
5. Step 5: Solve for x
   x = 157,218,830.89/13,143.82
6. Step 6: Final answer
   x = 11,961.43