Finding the Fourth Proportional to 2,830.92, 3,908.58 and 2,085.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.92 : 3,908.58 = 2,085.72 : x
2. Step 2: Convert to fraction form
   2,830.92/3,908.58 = 2,085.72/x
3. Step 3: Cross multiply
   2,830.92x = 3,908.58 × 2,085.72
4. Step 4: Simplify right side
   2,830.92x = 8,152,203.48
5. Step 5: Solve for x
   x = 8,152,203.48/2,830.92
6. Step 6: Final answer
   x = 2,879.70