Finding the Fourth Proportional to 2,216.12, 3,320.06 and 828.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.12 : 3,320.06 = 828.59 : x
2. Step 2: Convert to fraction form
   2,216.12/3,320.06 = 828.59/x
3. Step 3: Cross multiply
   2,216.12x = 3,320.06 × 828.59
4. Step 4: Simplify right side
   2,216.12x = 2,750,947.77
5. Step 5: Solve for x
   x = 2,750,947.77/2,216.12
6. Step 6: Final answer
   x = 1,241.34