Finding the Fourth Proportional to 2,776.32, 4,165.12 and 828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,776.32 : 4,165.12 = 828.72 : x
2. Step 2: Convert to fraction form
   2,776.32/4,165.12 = 828.72/x
3. Step 3: Cross multiply
   2,776.32x = 4,165.12 × 828.72
4. Step 4: Simplify right side
   2,776.32x = 3,451,718.25
5. Step 5: Solve for x
   x = 3,451,718.25/2,776.32
6. Step 6: Final answer
   x = 1,243.27