Finding the Fourth Proportional to 108.72, 162.87 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   108.72 : 162.87 = 67.50 : x
2. Step 2: Convert to fraction form
   108.72/162.87 = 67.50/x
3. Step 3: Cross multiply
   108.72x = 162.87 × 67.50
4. Step 4: Simplify right side
   108.72x = 10,993.73
5. Step 5: Solve for x
   x = 10,993.73/108.72
6. Step 6: Final answer
   x = 101.12