Finding the Fourth Proportional to 2,144.16, 3,215.42 and 912.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.16 : 3,215.42 = 912.15 : x
2. Step 2: Convert to fraction form
   2,144.16/3,215.42 = 912.15/x
3. Step 3: Cross multiply
   2,144.16x = 3,215.42 × 912.15
4. Step 4: Simplify right side
   2,144.16x = 2,932,940.79
5. Step 5: Solve for x
   x = 2,932,940.79/2,144.16
6. Step 6: Final answer
   x = 1,367.87