Finding the Fourth Proportional to 8,311.86, 12,470.15 and 3,385.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311.86 : 12,470.15 = 3,385.03 : x
2. Step 2: Convert to fraction form
   8,311.86/12,470.15 = 3,385.03/x
3. Step 3: Cross multiply
   8,311.86x = 12,470.15 × 3,385.03
4. Step 4: Simplify right side
   8,311.86x = 42,211,831.85
5. Step 5: Solve for x
   x = 42,211,831.85/8,311.86
6. Step 6: Final answer
   x = 5,078.51