Finding the Fourth Proportional to 2,618.47, 3,613.68 and 1,439.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.47 : 3,613.68 = 1,439.56 : x
2. Step 2: Convert to fraction form
   2,618.47/3,613.68 = 1,439.56/x
3. Step 3: Cross multiply
   2,618.47x = 3,613.68 × 1,439.56
4. Step 4: Simplify right side
   2,618.47x = 5,202,083.91
5. Step 5: Solve for x
   x = 5,202,083.91/2,618.47
6. Step 6: Final answer
   x = 1,986.69