Finding the Fourth Proportional to 2,618.82, 3,613.89 and 1,439.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.82 : 3,613.89 = 1,439.88 : x
2. Step 2: Convert to fraction form
   2,618.82/3,613.89 = 1,439.88/x
3. Step 3: Cross multiply
   2,618.82x = 3,613.89 × 1,439.88
4. Step 4: Simplify right side
   2,618.82x = 5,203,567.93
5. Step 5: Solve for x
   x = 5,203,567.93/2,618.82
6. Step 6: Final answer
   x = 1,986.99