Finding the Fourth Proportional to 2,811.18, 3,879.81 and 2,111.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,811.18 : 3,879.81 = 2,111.34 : x
2. Step 2: Convert to fraction form
   2,811.18/3,879.81 = 2,111.34/x
3. Step 3: Cross multiply
   2,811.18x = 3,879.81 × 2,111.34
4. Step 4: Simplify right side
   2,811.18x = 8,191,598.05
5. Step 5: Solve for x
   x = 8,191,598.05/2,811.18
6. Step 6: Final answer
   x = 2,913.94