Finding the Fourth Proportional to 2,215.82, 3,323.79 and 828.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.82 : 3,323.79 = 828.89 : x
2. Step 2: Convert to fraction form
   2,215.82/3,323.79 = 828.89/x
3. Step 3: Cross multiply
   2,215.82x = 3,323.79 × 828.89
4. Step 4: Simplify right side
   2,215.82x = 2,755,062.94
5. Step 5: Solve for x
   x = 2,755,062.94/2,215.82
6. Step 6: Final answer
   x = 1,243.36