Finding the Fourth Proportional to 8,311.78, 12,470.02 and 3,384.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311.78 : 12,470.02 = 3,384.96 : x
2. Step 2: Convert to fraction form
   8,311.78/12,470.02 = 3,384.96/x
3. Step 3: Cross multiply
   8,311.78x = 12,470.02 × 3,384.96
4. Step 4: Simplify right side
   8,311.78x = 42,210,518.90
5. Step 5: Solve for x
   x = 42,210,518.90/8,311.78
6. Step 6: Final answer
   x = 5,078.40