Finding the Fourth Proportional to 12,453.38, 18,659.31 and 10,239.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,453.38 : 18,659.31 = 10,239.04 : x
2. Step 2: Convert to fraction form
   12,453.38/18,659.31 = 10,239.04/x
3. Step 3: Cross multiply
   12,453.38x = 18,659.31 × 10,239.04
4. Step 4: Simplify right side
   12,453.38x = 191,053,406.39
5. Step 5: Solve for x
   x = 191,053,406.39/12,453.38
6. Step 6: Final answer
   x = 15,341.49