Finding the Fourth Proportional to 13,180.43, 18,178.72 and 8,465.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,180.43 : 18,178.72 = 8,465.15 : x
2. Step 2: Convert to fraction form
   13,180.43/18,178.72 = 8,465.15/x
3. Step 3: Cross multiply
   13,180.43x = 18,178.72 × 8,465.15
4. Step 4: Simplify right side
   13,180.43x = 153,885,591.61
5. Step 5: Solve for x
   x = 153,885,591.61/13,180.43
6. Step 6: Final answer
   x = 11,675.31