Finding the Fourth Proportional to 3,879.42, 5,353.61 and 2,111.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.42 : 5,353.61 = 2,111.02 : x
2. Step 2: Convert to fraction form
   3,879.42/5,353.61 = 2,111.02/x
3. Step 3: Cross multiply
   3,879.42x = 5,353.61 × 2,111.02
4. Step 4: Simplify right side
   3,879.42x = 11,301,577.78
5. Step 5: Solve for x
   x = 11,301,577.78/3,879.42
6. Step 6: Final answer
   x = 2,913.21