Finding the Fourth Proportional to 6,105.78, 8,425.94 and 3,311.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,105.78 : 8,425.94 = 3,311.28 : x
2. Step 2: Convert to fraction form
   6,105.78/8,425.94 = 3,311.28/x
3. Step 3: Cross multiply
   6,105.78x = 8,425.94 × 3,311.28
4. Step 4: Simplify right side
   6,105.78x = 27,900,646.60
5. Step 5: Solve for x
   x = 27,900,646.60/6,105.78
6. Step 6: Final answer
   x = 4,569.55