Finding the Fourth Proportional to 8,326.41, 12,478.79 and 3,390.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,326.41 : 12,478.79 = 3,390.27 : x
2. Step 2: Convert to fraction form
   8,326.41/12,478.79 = 3,390.27/x
3. Step 3: Cross multiply
   8,326.41x = 12,478.79 × 3,390.27
4. Step 4: Simplify right side
   8,326.41x = 42,306,481.62
5. Step 5: Solve for x
   x = 42,306,481.62/8,326.41
6. Step 6: Final answer
   x = 5,081.00