Finding the Fourth Proportional to 2,144.50, 3,215.91 and 911.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.50 : 3,215.91 = 911.96 : x
2. Step 2: Convert to fraction form
   2,144.50/3,215.91 = 911.96/x
3. Step 3: Cross multiply
   2,144.50x = 3,215.91 × 911.96
4. Step 4: Simplify right side
   2,144.50x = 2,932,781.28
5. Step 5: Solve for x
   x = 2,932,781.28/2,144.50
6. Step 6: Final answer
   x = 1,367.58