Finding the Fourth Proportional to 2,618.03, 3,612.88 and 1,439.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.03 : 3,612.88 = 1,439.18 : x
2. Step 2: Convert to fraction form
   2,618.03/3,612.88 = 1,439.18/x
3. Step 3: Cross multiply
   2,618.03x = 3,612.88 × 1,439.18
4. Step 4: Simplify right side
   2,618.03x = 5,199,584.64
5. Step 5: Solve for x
   x = 5,199,584.64/2,618.03
6. Step 6: Final answer
   x = 1,986.07