Finding the Fourth Proportional to 6,311.55, 8,709.27 and 3,478.77

Step by Step Solution

1. Step 1: Write the proportion equation
   6,311.55 : 8,709.27 = 3,478.77 : x
2. Step 2: Convert to fraction form
   6,311.55/8,709.27 = 3,478.77/x
3. Step 3: Cross multiply
   6,311.55x = 8,709.27 × 3,478.77
4. Step 4: Simplify right side
   6,311.55x = 30,297,578.22
5. Step 5: Solve for x
   x = 30,297,578.22/6,311.55
6. Step 6: Final answer
   x = 4,800.34