Finding the Fourth Proportional to 2,768.32, 4,153.12 and 820.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,768.32 : 4,153.12 = 820.72 : x
2. Step 2: Convert to fraction form
   2,768.32/4,153.12 = 820.72/x
3. Step 3: Cross multiply
   2,768.32x = 4,153.12 × 820.72
4. Step 4: Simplify right side
   2,768.32x = 3,408,548.65
5. Step 5: Solve for x
   x = 3,408,548.65/2,768.32
6. Step 6: Final answer
   x = 1,231.27