Finding the Fourth Proportional to 2,879.63, 4,320.46 and 931.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,879.63 : 4,320.46 = 931.83 : x
2. Step 2: Convert to fraction form
   2,879.63/4,320.46 = 931.83/x
3. Step 3: Cross multiply
   2,879.63x = 4,320.46 × 931.83
4. Step 4: Simplify right side
   2,879.63x = 4,025,933.98
5. Step 5: Solve for x
   x = 4,025,933.98/2,879.63
6. Step 6: Final answer
   x = 1,398.08