Finding the Fourth Proportional to 12,439.86, 17,161.77 and 8,240.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.86 : 17,161.77 = 8,240.82 : x
2. Step 2: Convert to fraction form
   12,439.86/17,161.77 = 8,240.82/x
3. Step 3: Cross multiply
   12,439.86x = 17,161.77 × 8,240.82
4. Step 4: Simplify right side
   12,439.86x = 141,427,057.45
5. Step 5: Solve for x
   x = 141,427,057.45/12,439.86
6. Step 6: Final answer
   x = 11,368.86