Finding the Fourth Proportional to 168.72, 231.15 and 162.24

Step by Step Solution

1. Step 1: Write the proportion equation
   168.72 : 231.15 = 162.24 : x
2. Step 2: Convert to fraction form
   168.72/231.15 = 162.24/x
3. Step 3: Cross multiply
   168.72x = 231.15 × 162.24
4. Step 4: Simplify right side
   168.72x = 37,501.78
5. Step 5: Solve for x
   x = 37,501.78/168.72
6. Step 6: Final answer
   x = 222.27