Finding the Fourth Proportional to 2,143.82, 3,216.12 and 911.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.82 : 3,216.12 = 911.18 : x
2. Step 2: Convert to fraction form
   2,143.82/3,216.12 = 911.18/x
3. Step 3: Cross multiply
   2,143.82x = 3,216.12 × 911.18
4. Step 4: Simplify right side
   2,143.82x = 2,930,464.22
5. Step 5: Solve for x
   x = 2,930,464.22/2,143.82
6. Step 6: Final answer
   x = 1,366.94