Finding the Fourth Proportional to 2,279.64, 3,141.77 and 1,689.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.64 : 3,141.77 = 1,689.15 : x
2. Step 2: Convert to fraction form
   2,279.64/3,141.77 = 1,689.15/x
3. Step 3: Cross multiply
   2,279.64x = 3,141.77 × 1,689.15
4. Step 4: Simplify right side
   2,279.64x = 5,306,920.80
5. Step 5: Solve for x
   x = 5,306,920.80/2,279.64
6. Step 6: Final answer
   x = 2,327.96