Finding the Fourth Proportional to 67.72, 101.69 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   67.72 : 101.69 = 42.20 : x
2. Step 2: Convert to fraction form
   67.72/101.69 = 42.20/x
3. Step 3: Cross multiply
   67.72x = 101.69 × 42.20
4. Step 4: Simplify right side
   67.72x = 4,291.11
5. Step 5: Solve for x
   x = 4,291.11/67.72
6. Step 6: Final answer
   x = 63.37