Finding the Third Proportional to 396.56 and 828.56

Step by Step Solution

1. Step 1: Write the proportion equation
   396.56 : 828.56 = 828.56 : x
2. Step 2: Convert to fraction form
   396.56/828.56 = 828.56/x
3. Step 3: Cross multiply
   396.56x = 828.56 × 828.56
4. Step 4: Simplify right side
   396.56x = 686,515.82
5. Step 5: Solve for x
   x = 686,515.82/396.56
6. Step 6: Final answer
   x = 1,731.17