Finding the Fourth Proportional to 2,215.70, 3,321.51 and 828.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.70 : 3,321.51 = 828.33 : x
2. Step 2: Convert to fraction form
   2,215.70/3,321.51 = 828.33/x
3. Step 3: Cross multiply
   2,215.70x = 3,321.51 × 828.33
4. Step 4: Simplify right side
   2,215.70x = 2,751,290.82
5. Step 5: Solve for x
   x = 2,751,290.82/2,215.70
6. Step 6: Final answer
   x = 1,241.72