Finding the Fourth Proportional to 12,427.52, 17,142.72 and 8,401.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,427.52 : 17,142.72 = 8,401.28 : x
2. Step 2: Convert to fraction form
   12,427.52/17,142.72 = 8,401.28/x
3. Step 3: Cross multiply
   12,427.52x = 17,142.72 × 8,401.28
4. Step 4: Simplify right side
   12,427.52x = 144,020,790.68
5. Step 5: Solve for x
   x = 144,020,790.68/12,427.52
6. Step 6: Final answer
   x = 11,588.86