Finding the Third Proportional to 71.91 and 111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   71.91 : 111.56 = 111.56 : x
2. Step 2: Convert to fraction form
   71.91/111.56 = 111.56/x
3. Step 3: Cross multiply
   71.91x = 111.56 × 111.56
4. Step 4: Simplify right side
   71.91x = 12,446.19
5. Step 5: Solve for x
   x = 12,446.19/71.91
6. Step 6: Final answer
   x = 173.09