Finding the Fourth Proportional to 2,391.78, 3,583.47 and 1,661.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.78 : 3,583.47 = 1,661.82 : x
2. Step 2: Convert to fraction form
   2,391.78/3,583.47 = 1,661.82/x
3. Step 3: Cross multiply
   2,391.78x = 3,583.47 × 1,661.82
4. Step 4: Simplify right side
   2,391.78x = 5,955,082.12
5. Step 5: Solve for x
   x = 5,955,082.12/2,391.78
6. Step 6: Final answer
   x = 2,489.81