Finding the Fourth Proportional to 2,399.28, 3,289.41 and 2,355.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.28 : 3,289.41 = 2,355.54 : x
2. Step 2: Convert to fraction form
   2,399.28/3,289.41 = 2,355.54/x
3. Step 3: Cross multiply
   2,399.28x = 3,289.41 × 2,355.54
4. Step 4: Simplify right side
   2,399.28x = 7,748,336.83
5. Step 5: Solve for x
   x = 7,748,336.83/2,399.28
6. Step 6: Final answer
   x = 3,229.44