Finding the Fourth Proportional to 3,256.78, 4,879.35 and 2,789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,256.78 : 4,879.35 = 2,789.98 : x
2. Step 2: Convert to fraction form
   3,256.78/4,879.35 = 2,789.98/x
3. Step 3: Cross multiply
   3,256.78x = 4,879.35 × 2,789.98
4. Step 4: Simplify right side
   3,256.78x = 13,613,288.91
5. Step 5: Solve for x
   x = 13,613,288.91/3,256.78
6. Step 6: Final answer
   x = 4,179.98