Finding the Third Proportional to 172.13 and 243.56

Step by Step Solution

1. Step 1: Write the proportion equation
   172.13 : 243.56 = 243.56 : x
2. Step 2: Convert to fraction form
   172.13/243.56 = 243.56/x
3. Step 3: Cross multiply
   172.13x = 243.56 × 243.56
4. Step 4: Simplify right side
   172.13x = 59,322.69
5. Step 5: Solve for x
   x = 59,322.69/172.13
6. Step 6: Final answer
   x = 344.65