Finding the Fourth Proportional to 8,311.94, 12,470.25 and 3,385.11

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311.94 : 12,470.25 = 3,385.11 : x
2. Step 2: Convert to fraction form
   8,311.94/12,470.25 = 3,385.11/x
3. Step 3: Cross multiply
   8,311.94x = 12,470.25 × 3,385.11
4. Step 4: Simplify right side
   8,311.94x = 42,213,167.98
5. Step 5: Solve for x
   x = 42,213,167.98/8,311.94
6. Step 6: Final answer
   x = 5,078.62