Finding the Fourth Proportional to 2,282.42, 3,422.82 and 821.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,282.42 : 3,422.82 = 821.18 : x
2. Step 2: Convert to fraction form
   2,282.42/3,422.82 = 821.18/x
3. Step 3: Cross multiply
   2,282.42x = 3,422.82 × 821.18
4. Step 4: Simplify right side
   2,282.42x = 2,810,751.33
5. Step 5: Solve for x
   x = 2,810,751.33/2,282.42
6. Step 6: Final answer
   x = 1,231.48