Finding the Fourth Proportional to 2,144.60, 3,216.33 and 911.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.60 : 3,216.33 = 911.37 : x
2. Step 2: Convert to fraction form
   2,144.60/3,216.33 = 911.37/x
3. Step 3: Cross multiply
   2,144.60x = 3,216.33 × 911.37
4. Step 4: Simplify right side
   2,144.60x = 2,931,266.67
5. Step 5: Solve for x
   x = 2,931,266.67/2,144.60
6. Step 6: Final answer
   x = 1,366.81