Finding the Third Proportional to 70.72 and 109.28

Step by Step Solution

1. Step 1: Write the proportion equation
   70.72 : 109.28 = 109.28 : x
2. Step 2: Convert to fraction form
   70.72/109.28 = 109.28/x
3. Step 3: Cross multiply
   70.72x = 109.28 × 109.28
4. Step 4: Simplify right side
   70.72x = 11,941.86
5. Step 5: Solve for x
   x = 11,941.86/70.72
6. Step 6: Final answer
   x = 168.87