Finding the Fourth Proportional to 2,143.83, 3,216.09 and 911.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.83 : 3,216.09 = 911.25 : x
2. Step 2: Convert to fraction form
   2,143.83/3,216.09 = 911.25/x
3. Step 3: Cross multiply
   2,143.83x = 3,216.09 × 911.25
4. Step 4: Simplify right side
   2,143.83x = 2,930,660.30
5. Step 5: Solve for x
   x = 2,930,660.30/2,143.83
6. Step 6: Final answer
   x = 1,367.02