Finding the Fourth Proportional to 12,104.52, 18,142.74 and 8,147.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,104.52 : 18,142.74 = 8,147.40 : x
2. Step 2: Convert to fraction form
   12,104.52/18,142.74 = 8,147.40/x
3. Step 3: Cross multiply
   12,104.52x = 18,142.74 × 8,147.40
4. Step 4: Simplify right side
   12,104.52x = 147,816,159.88
5. Step 5: Solve for x
   x = 147,816,159.88/12,104.52
6. Step 6: Final answer
   x = 12,211.65