Finding the Fourth Proportional to 2,618.69, 3,613.85 and 1,439.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.69 : 3,613.85 = 1,439.82 : x
2. Step 2: Convert to fraction form
   2,618.69/3,613.85 = 1,439.82/x
3. Step 3: Cross multiply
   2,618.69x = 3,613.85 × 1,439.82
4. Step 4: Simplify right side
   2,618.69x = 5,203,286.31
5. Step 5: Solve for x
   x = 5,203,286.31/2,618.69
6. Step 6: Final answer
   x = 1,986.98