Finding the Fourth Proportional to 2,618.39, 3,613.38 and 1,439.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.39 : 3,613.38 = 1,439.48 : x
2. Step 2: Convert to fraction form
   2,618.39/3,613.38 = 1,439.48/x
3. Step 3: Cross multiply
   2,618.39x = 3,613.38 × 1,439.48
4. Step 4: Simplify right side
   2,618.39x = 5,201,388.24
5. Step 5: Solve for x
   x = 5,201,388.24/2,618.39
6. Step 6: Final answer
   x = 1,986.48