Finding the Fourth Proportional to 2,589.03, 3,879.77 and 1,288.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,589.03 : 3,879.77 = 1,288.71 : x
2. Step 2: Convert to fraction form
   2,589.03/3,879.77 = 1,288.71/x
3. Step 3: Cross multiply
   2,589.03x = 3,879.77 × 1,288.71
4. Step 4: Simplify right side
   2,589.03x = 4,999,891.95
5. Step 5: Solve for x
   x = 4,999,891.95/2,589.03
6. Step 6: Final answer
   x = 1,931.18