Finding the Fourth Proportional to 12,661.57, 17,472.27 and 8,187.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.57 : 17,472.27 = 8,187.67 : x
2. Step 2: Convert to fraction form
   12,661.57/17,472.27 = 8,187.67/x
3. Step 3: Cross multiply
   12,661.57x = 17,472.27 × 8,187.67
4. Step 4: Simplify right side
   12,661.57x = 143,057,180.91
5. Step 5: Solve for x
   x = 143,057,180.91/12,661.57
6. Step 6: Final answer
   x = 11,298.53