Finding the Fourth Proportional to 2,618.69, 3,613.83 and 1,439.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.69 : 3,613.83 = 1,439.75 : x
2. Step 2: Convert to fraction form
   2,618.69/3,613.83 = 1,439.75/x
3. Step 3: Cross multiply
   2,618.69x = 3,613.83 × 1,439.75
4. Step 4: Simplify right side
   2,618.69x = 5,203,011.74
5. Step 5: Solve for x
   x = 5,203,011.74/2,618.69
6. Step 6: Final answer
   x = 1,986.88