Finding the Fourth Proportional to 3,866.72, 5,787.24 and 3,520.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,866.72 : 5,787.24 = 3,520.85 : x
2. Step 2: Convert to fraction form
   3,866.72/5,787.24 = 3,520.85/x
3. Step 3: Cross multiply
   3,866.72x = 5,787.24 × 3,520.85
4. Step 4: Simplify right side
   3,866.72x = 20,375,975.02
5. Step 5: Solve for x
   x = 20,375,975.02/3,866.72
6. Step 6: Final answer
   x = 5,269.58