Finding the Fourth Proportional to 2,399.40, 3,603.15 and 1,581.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.40 : 3,603.15 = 1,581.30 : x
2. Step 2: Convert to fraction form
   2,399.40/3,603.15 = 1,581.30/x
3. Step 3: Cross multiply
   2,399.40x = 3,603.15 × 1,581.30
4. Step 4: Simplify right side
   2,399.40x = 5,697,661.10
5. Step 5: Solve for x
   x = 5,697,661.10/2,399.40
6. Step 6: Final answer
   x = 2,374.62