Finding the Fourth Proportional to 12,393.20, 17,097.91 and 8,146.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,393.20 : 17,097.91 = 8,146.55 : x
2. Step 2: Convert to fraction form
   12,393.20/17,097.91 = 8,146.55/x
3. Step 3: Cross multiply
   12,393.20x = 17,097.91 × 8,146.55
4. Step 4: Simplify right side
   12,393.20x = 139,288,978.71
5. Step 5: Solve for x
   x = 139,288,978.71/12,393.20
6. Step 6: Final answer
   x = 11,239.15