Finding the Fourth Proportional to 12,144.94, 18,234.18 and 8,387.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,144.94 : 18,234.18 = 8,387.90 : x
2. Step 2: Convert to fraction form
   12,144.94/18,234.18 = 8,387.90/x
3. Step 3: Cross multiply
   12,144.94x = 18,234.18 × 8,387.90
4. Step 4: Simplify right side
   12,144.94x = 152,946,478.42
5. Step 5: Solve for x
   x = 152,946,478.42/12,144.94
6. Step 6: Final answer
   x = 12,593.43