Finding the Third Proportional to 615.56 and 676.31

Step by Step Solution

1. Step 1: Write the proportion equation
   615.56 : 676.31 = 676.31 : x
2. Step 2: Convert to fraction form
   615.56/676.31 = 676.31/x
3. Step 3: Cross multiply
   615.56x = 676.31 × 676.31
4. Step 4: Simplify right side
   615.56x = 457,398.60
5. Step 5: Solve for x
   x = 457,398.60/615.56
6. Step 6: Final answer
   x = 743.06