Finding the Fourth Proportional to 8,238.72, 12,370.39 and 8,115.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,238.72 : 12,370.39 = 8,115.71 : x
2. Step 2: Convert to fraction form
   8,238.72/12,370.39 = 8,115.71/x
3. Step 3: Cross multiply
   8,238.72x = 12,370.39 × 8,115.71
4. Step 4: Simplify right side
   8,238.72x = 100,394,508.46
5. Step 5: Solve for x
   x = 100,394,508.46/8,238.72
6. Step 6: Final answer
   x = 12,185.69