Finding the Fourth Proportional to 2,617.91, 3,612.77 and 1,439.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.91 : 3,612.77 = 1,439.03 : x
2. Step 2: Convert to fraction form
   2,617.91/3,612.77 = 1,439.03/x
3. Step 3: Cross multiply
   2,617.91x = 3,612.77 × 1,439.03
4. Step 4: Simplify right side
   2,617.91x = 5,198,859.15
5. Step 5: Solve for x
   x = 5,198,859.15/2,617.91
6. Step 6: Final answer
   x = 1,985.89