Finding the Fourth Proportional to 2,618.10, 3,612.96 and 1,439.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.10 : 3,612.96 = 1,439.16 : x
2. Step 2: Convert to fraction form
   2,618.10/3,612.96 = 1,439.16/x
3. Step 3: Cross multiply
   2,618.10x = 3,612.96 × 1,439.16
4. Step 4: Simplify right side
   2,618.10x = 5,199,627.51
5. Step 5: Solve for x
   x = 5,199,627.51/2,618.10
6. Step 6: Final answer
   x = 1,986.03