Finding the Fourth Proportional to 2,085.27, 2,879.33 and 1,289.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.27 : 2,879.33 = 1,289.76 : x
2. Step 2: Convert to fraction form
   2,085.27/2,879.33 = 1,289.76/x
3. Step 3: Cross multiply
   2,085.27x = 2,879.33 × 1,289.76
4. Step 4: Simplify right side
   2,085.27x = 3,713,638.21
5. Step 5: Solve for x
   x = 3,713,638.21/2,085.27
6. Step 6: Final answer
   x = 1,780.89