Finding the Fourth Proportional to 168.01, 231.24 and 160.72

Step by Step Solution

1. Step 1: Write the proportion equation
   168.01 : 231.24 = 160.72 : x
2. Step 2: Convert to fraction form
   168.01/231.24 = 160.72/x
3. Step 3: Cross multiply
   168.01x = 231.24 × 160.72
4. Step 4: Simplify right side
   168.01x = 37,164.89
5. Step 5: Solve for x
   x = 37,164.89/168.01
6. Step 6: Final answer
   x = 221.21