Finding the Third Proportional to 670.31 and 771.56

Step by Step Solution

1. Step 1: Write the proportion equation
   670.31 : 771.56 = 771.56 : x
2. Step 2: Convert to fraction form
   670.31/771.56 = 771.56/x
3. Step 3: Cross multiply
   670.31x = 771.56 × 771.56
4. Step 4: Simplify right side
   670.31x = 595,308.69
5. Step 5: Solve for x
   x = 595,308.69/670.31
6. Step 6: Final answer
   x = 888.11