Finding the Fourth Proportional to 3,879.72, 5,354.06 and 2,111.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.72 : 5,354.06 = 2,111.33 : x
2. Step 2: Convert to fraction form
   3,879.72/5,354.06 = 2,111.33/x
3. Step 3: Cross multiply
   3,879.72x = 5,354.06 × 2,111.33
4. Step 4: Simplify right side
   3,879.72x = 11,304,166.01
5. Step 5: Solve for x
   x = 11,304,166.01/3,879.72
6. Step 6: Final answer
   x = 2,913.66