Finding the Fourth Proportional to 2,644.84, 3,964.86 and 912.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,644.84 : 3,964.86 = 912.28 : x
2. Step 2: Convert to fraction form
   2,644.84/3,964.86 = 912.28/x
3. Step 3: Cross multiply
   2,644.84x = 3,964.86 × 912.28
4. Step 4: Simplify right side
   2,644.84x = 3,617,062.48
5. Step 5: Solve for x
   x = 3,617,062.48/2,644.84
6. Step 6: Final answer
   x = 1,367.59