Finding the Fourth Proportional to 2,928.20, 4,367.31 and 2,879.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,928.20 : 4,367.31 = 2,879.06 : x
2. Step 2: Convert to fraction form
   2,928.20/4,367.31 = 2,879.06/x
3. Step 3: Cross multiply
   2,928.20x = 4,367.31 × 2,879.06
4. Step 4: Simplify right side
   2,928.20x = 12,573,714.90
5. Step 5: Solve for x
   x = 12,573,714.90/2,928.20
6. Step 6: Final answer
   x = 4,294.02