Finding the Fourth Proportional to 3,920.83, 5,879.68 and 1,728

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.83 : 5,879.68 = 1,728 : x
2. Step 2: Convert to fraction form
   3,920.83/5,879.68 = 1,728/x
3. Step 3: Cross multiply
   3,920.83x = 5,879.68 × 1,728
4. Step 4: Simplify right side
   3,920.83x = 10,160,082.72
5. Step 5: Solve for x
   x = 10,160,082.72/3,920.83
6. Step 6: Final answer
   x = 2,591.31