Finding the Third Proportional to 72.09 and 155.81

Step by Step Solution

1. Step 1: Write the proportion equation
   72.09 : 155.81 = 155.81 : x
2. Step 2: Convert to fraction form
   72.09/155.81 = 155.81/x
3. Step 3: Cross multiply
   72.09x = 155.81 × 155.81
4. Step 4: Simplify right side
   72.09x = 24,277.54
5. Step 5: Solve for x
   x = 24,277.54/72.09
6. Step 6: Final answer
   x = 336.75