Finding the Fourth Proportional to 3,879.38, 5,353.52 and 2,111.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.38 : 5,353.52 = 2,111.06 : x
2. Step 2: Convert to fraction form
   3,879.38/5,353.52 = 2,111.06/x
3. Step 3: Cross multiply
   3,879.38x = 5,353.52 × 2,111.06
4. Step 4: Simplify right side
   3,879.38x = 11,301,601.93
5. Step 5: Solve for x
   x = 11,301,601.93/3,879.38
6. Step 6: Final answer
   x = 2,913.25