Finding the Fourth Proportional to 12,294.15, 18,456.78 and 10,239.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,294.15 : 18,456.78 = 10,239.30 : x
2. Step 2: Convert to fraction form
   12,294.15/18,456.78 = 10,239.30/x
3. Step 3: Cross multiply
   12,294.15x = 18,456.78 × 10,239.30
4. Step 4: Simplify right side
   12,294.15x = 188,984,507.45
5. Step 5: Solve for x
   x = 188,984,507.45/12,294.15
6. Step 6: Final answer
   x = 15,371.91