Finding the Fourth Proportional to 3,879.83, 5,354.18 and 2,111.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.83 : 5,354.18 = 2,111.45 : x
2. Step 2: Convert to fraction form
   3,879.83/5,354.18 = 2,111.45/x
3. Step 3: Cross multiply
   3,879.83x = 5,354.18 × 2,111.45
4. Step 4: Simplify right side
   3,879.83x = 11,305,059.42
5. Step 5: Solve for x
   x = 11,305,059.42/3,879.83
6. Step 6: Final answer
   x = 2,913.81