Finding the Fourth Proportional to 3,879.71, 5,353.83 and 2,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.71 : 5,353.83 = 2,111.31 : x
2. Step 2: Convert to fraction form
   3,879.71/5,353.83 = 2,111.31/x
3. Step 3: Cross multiply
   3,879.71x = 5,353.83 × 2,111.31
4. Step 4: Simplify right side
   3,879.71x = 11,303,594.82
5. Step 5: Solve for x
   x = 11,303,594.82/3,879.71
6. Step 6: Final answer
   x = 2,913.52