Finding the Fourth Proportional to 6,311.72, 8,710.16 and 3,478.88

Step by Step Solution

1. Step 1: Write the proportion equation
   6,311.72 : 8,710.16 = 3,478.88 : x
2. Step 2: Convert to fraction form
   6,311.72/8,710.16 = 3,478.88/x
3. Step 3: Cross multiply
   6,311.72x = 8,710.16 × 3,478.88
4. Step 4: Simplify right side
   6,311.72x = 30,301,601.42
5. Step 5: Solve for x
   x = 30,301,601.42/6,311.72
6. Step 6: Final answer
   x = 4,800.85