Finding the Fourth Proportional to 2,768.56, 4,152.88 and 820.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,768.56 : 4,152.88 = 820.82 : x
2. Step 2: Convert to fraction form
   2,768.56/4,152.88 = 820.82/x
3. Step 3: Cross multiply
   2,768.56x = 4,152.88 × 820.82
4. Step 4: Simplify right side
   2,768.56x = 3,408,766.96
5. Step 5: Solve for x
   x = 3,408,766.96/2,768.56
6. Step 6: Final answer
   x = 1,231.24