Finding the Third Proportional to 111.38 and 172.13

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 172.13 = 172.13 : x
2. Step 2: Convert to fraction form
   111.38/172.13 = 172.13/x
3. Step 3: Cross multiply
   111.38x = 172.13 × 172.13
4. Step 4: Simplify right side
   111.38x = 29,627.02
5. Step 5: Solve for x
   x = 29,627.02/111.38
6. Step 6: Final answer
   x = 266.01