Finding the Fourth Proportional to 2,439.59, 3,661.20 and 1,617.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.59 : 3,661.20 = 1,617.57 : x
2. Step 2: Convert to fraction form
   2,439.59/3,661.20 = 1,617.57/x
3. Step 3: Cross multiply
   2,439.59x = 3,661.20 × 1,617.57
4. Step 4: Simplify right side
   2,439.59x = 5,922,247.28
5. Step 5: Solve for x
   x = 5,922,247.28/2,439.59
6. Step 6: Final answer
   x = 2,427.56