Finding the Fourth Proportional to 12,288.78, 18,414.09 and 8,124.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.78 : 18,414.09 = 8,124.30 : x
2. Step 2: Convert to fraction form
   12,288.78/18,414.09 = 8,124.30/x
3. Step 3: Cross multiply
   12,288.78x = 18,414.09 × 8,124.30
4. Step 4: Simplify right side
   12,288.78x = 149,601,591.39
5. Step 5: Solve for x
   x = 149,601,591.39/12,288.78
6. Step 6: Final answer
   x = 12,173.84