Finding the Fourth Proportional to 6,864.72, 9,474.56 and 3,880.55

Step by Step Solution

1. Step 1: Write the proportion equation
   6,864.72 : 9,474.56 = 3,880.55 : x
2. Step 2: Convert to fraction form
   6,864.72/9,474.56 = 3,880.55/x
3. Step 3: Cross multiply
   6,864.72x = 9,474.56 × 3,880.55
4. Step 4: Simplify right side
   6,864.72x = 36,766,456.44
5. Step 5: Solve for x
   x = 36,766,456.44/6,864.72
6. Step 6: Final answer
   x = 5,355.86