Finding the Third Proportional to 72.56 and 111.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 111.80 = 111.80 : x
2. Step 2: Convert to fraction form
   72.56/111.80 = 111.80/x
3. Step 3: Cross multiply
   72.56x = 111.80 × 111.80
4. Step 4: Simplify right side
   72.56x = 12,498.54
5. Step 5: Solve for x
   x = 12,498.54/72.56
6. Step 6: Final answer
   x = 172.25