Finding the Fourth Proportional to 2,618.48, 3,613.47 and 1,439.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.48 : 3,613.47 = 1,439.54 : x
2. Step 2: Convert to fraction form
   2,618.48/3,613.47 = 1,439.54/x
3. Step 3: Cross multiply
   2,618.48x = 3,613.47 × 1,439.54
4. Step 4: Simplify right side
   2,618.48x = 5,201,716.54
5. Step 5: Solve for x
   x = 5,201,716.54/2,618.48
6. Step 6: Final answer
   x = 1,986.54