Finding the Fourth Proportional to 11,402.56, 17,086.56 and 8,467.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,402.56 : 17,086.56 = 8,467.20 : x
2. Step 2: Convert to fraction form
   11,402.56/17,086.56 = 8,467.20/x
3. Step 3: Cross multiply
   11,402.56x = 17,086.56 × 8,467.20
4. Step 4: Simplify right side
   11,402.56x = 144,675,320.83
5. Step 5: Solve for x
   x = 144,675,320.83/11,402.56
6. Step 6: Final answer
   x = 12,687.97