Finding the Fourth Proportional to 3,944.78, 5,440.71 and 2,528.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,944.78 : 5,440.71 = 2,528.60 : x
2. Step 2: Convert to fraction form
   3,944.78/5,440.71 = 2,528.60/x
3. Step 3: Cross multiply
   3,944.78x = 5,440.71 × 2,528.60
4. Step 4: Simplify right side
   3,944.78x = 13,757,352.10
5. Step 5: Solve for x
   x = 13,757,352.10/3,944.78
6. Step 6: Final answer
   x = 3,487.49