Finding the Fourth Proportional to 2,144.15, 3,216.56 and 911.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.15 : 3,216.56 = 911.56 : x
2. Step 2: Convert to fraction form
   2,144.15/3,216.56 = 911.56/x
3. Step 3: Cross multiply
   2,144.15x = 3,216.56 × 911.56
4. Step 4: Simplify right side
   2,144.15x = 2,932,087.43
5. Step 5: Solve for x
   x = 2,932,087.43/2,144.15
6. Step 6: Final answer
   x = 1,367.48