Finding the Fourth Proportional to 3,911.80, 5,398.22 and 2,233.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.80 : 5,398.22 = 2,233.30 : x
2. Step 2: Convert to fraction form
   3,911.80/5,398.22 = 2,233.30/x
3. Step 3: Cross multiply
   3,911.80x = 5,398.22 × 2,233.30
4. Step 4: Simplify right side
   3,911.80x = 12,055,844.73
5. Step 5: Solve for x
   x = 12,055,844.73/3,911.80
6. Step 6: Final answer
   x = 3,081.92