Finding the Fourth Proportional to 2,398.78, 3,288.73 and 2,355.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,398.78 : 3,288.73 = 2,355.04 : x
2. Step 2: Convert to fraction form
   2,398.78/3,288.73 = 2,355.04/x
3. Step 3: Cross multiply
   2,398.78x = 3,288.73 × 2,355.04
4. Step 4: Simplify right side
   2,398.78x = 7,745,078.92
5. Step 5: Solve for x
   x = 7,745,078.92/2,398.78
6. Step 6: Final answer
   x = 3,228.76