Finding the Fourth Proportional to 2,399.78, 3,290.10 and 2,356.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.78 : 3,290.10 = 2,356.04 : x
2. Step 2: Convert to fraction form
   2,399.78/3,290.10 = 2,356.04/x
3. Step 3: Cross multiply
   2,399.78x = 3,290.10 × 2,356.04
4. Step 4: Simplify right side
   2,399.78x = 7,751,607.20
5. Step 5: Solve for x
   x = 7,751,607.20/2,399.78
6. Step 6: Final answer
   x = 3,230.13