Finding the Fourth Proportional to 2,144.52, 3,215.76 and 911.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.52 : 3,215.76 = 911.26 : x
2. Step 2: Convert to fraction form
   2,144.52/3,215.76 = 911.26/x
3. Step 3: Cross multiply
   2,144.52x = 3,215.76 × 911.26
4. Step 4: Simplify right side
   2,144.52x = 2,930,372.82
5. Step 5: Solve for x
   x = 2,930,372.82/2,144.52
6. Step 6: Final answer
   x = 1,366.45