Finding the Fourth Proportional to 2,618.02, 3,613.08 and 1,439.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.02 : 3,613.08 = 1,439.31 : x
2. Step 2: Convert to fraction form
   2,618.02/3,613.08 = 1,439.31/x
3. Step 3: Cross multiply
   2,618.02x = 3,613.08 × 1,439.31
4. Step 4: Simplify right side
   2,618.02x = 5,200,347.57
5. Step 5: Solve for x
   x = 5,200,347.57/2,618.02
6. Step 6: Final answer
   x = 1,986.37