Finding the Fourth Proportional to 2,144.80, 3,216.68 and 828.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.80 : 3,216.68 = 828.12 : x
2. Step 2: Convert to fraction form
   2,144.80/3,216.68 = 828.12/x
3. Step 3: Cross multiply
   2,144.80x = 3,216.68 × 828.12
4. Step 4: Simplify right side
   2,144.80x = 2,663,797.04
5. Step 5: Solve for x
   x = 2,663,797.04/2,144.80
6. Step 6: Final answer
   x = 1,241.98