Finding the Fourth Proportional to 2,579.13, 3,866.67 and 1,279.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,579.13 : 3,866.67 = 1,279.89 : x
2. Step 2: Convert to fraction form
   2,579.13/3,866.67 = 1,279.89/x
3. Step 3: Cross multiply
   2,579.13x = 3,866.67 × 1,279.89
4. Step 4: Simplify right side
   2,579.13x = 4,948,912.27
5. Step 5: Solve for x
   x = 4,948,912.27/2,579.13
6. Step 6: Final answer
   x = 1,918.83