Finding the Fourth Proportional to 2,144.61, 3,216.65 and 911.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.61 : 3,216.65 = 911.52 : x
2. Step 2: Convert to fraction form
   2,144.61/3,216.65 = 911.52/x
3. Step 3: Cross multiply
   2,144.61x = 3,216.65 × 911.52
4. Step 4: Simplify right side
   2,144.61x = 2,932,036.25
5. Step 5: Solve for x
   x = 2,932,036.25/2,144.61
6. Step 6: Final answer
   x = 1,367.17