Finding the Fourth Proportional to 3,879.39, 5,353.40 and 2,111.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.39 : 5,353.40 = 2,111.00 : x
2. Step 2: Convert to fraction form
   3,879.39/5,353.40 = 2,111.00/x
3. Step 3: Cross multiply
   3,879.39x = 5,353.40 × 2,111.00
4. Step 4: Simplify right side
   3,879.39x = 11,300,990.08
5. Step 5: Solve for x
   x = 11,300,990.08/3,879.39
6. Step 6: Final answer
   x = 2,913.08