Finding the Fourth Proportional to 2,618.78, 3,613.89 and 1,439.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.78 : 3,613.89 = 1,439.82 : x
2. Step 2: Convert to fraction form
   2,618.78/3,613.89 = 1,439.82/x
3. Step 3: Cross multiply
   2,618.78x = 3,613.89 × 1,439.82
4. Step 4: Simplify right side
   2,618.78x = 5,203,351.10
5. Step 5: Solve for x
   x = 5,203,351.10/2,618.78
6. Step 6: Final answer
   x = 1,986.94