Finding the Fourth Proportional to 2,144.25, 3,216.28 and 828.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.25 : 3,216.28 = 828.63 : x
2. Step 2: Convert to fraction form
   2,144.25/3,216.28 = 828.63/x
3. Step 3: Cross multiply
   2,144.25x = 3,216.28 × 828.63
4. Step 4: Simplify right side
   2,144.25x = 2,665,106.10
5. Step 5: Solve for x
   x = 2,665,106.10/2,144.25
6. Step 6: Final answer
   x = 1,242.91