Finding the Fourth Proportional to 8,382.98, 12,478.71 and 8,258.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,382.98 : 12,478.71 = 8,258.42 : x
2. Step 2: Convert to fraction form
   8,382.98/12,478.71 = 8,258.42/x
3. Step 3: Cross multiply
   8,382.98x = 12,478.71 × 8,258.42
4. Step 4: Simplify right side
   8,382.98x = 103,054,386.95
5. Step 5: Solve for x
   x = 103,054,386.95/8,382.98
6. Step 6: Final answer
   x = 12,293.29