Finding the Fourth Proportional to 2,618.28, 3,613.22 and 1,439.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.28 : 3,613.22 = 1,439.34 : x
2. Step 2: Convert to fraction form
   2,618.28/3,613.22 = 1,439.34/x
3. Step 3: Cross multiply
   2,618.28x = 3,613.22 × 1,439.34
4. Step 4: Simplify right side
   2,618.28x = 5,200,644.88
5. Step 5: Solve for x
   x = 5,200,644.88/2,618.28
6. Step 6: Final answer
   x = 1,986.28