Finding the Third Proportional to 81.56 and 167.81

Step by Step Solution

1. Step 1: Write the proportion equation
   81.56 : 167.81 = 167.81 : x
2. Step 2: Convert to fraction form
   81.56/167.81 = 167.81/x
3. Step 3: Cross multiply
   81.56x = 167.81 × 167.81
4. Step 4: Simplify right side
   81.56x = 28,161.04
5. Step 5: Solve for x
   x = 28,161.04/81.56
6. Step 6: Final answer
   x = 345.27