Finding the Fourth Proportional to 111.63, 167.36 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111.63 : 167.36 = 42.20 : x
2. Step 2: Convert to fraction form
   111.63/167.36 = 42.20/x
3. Step 3: Cross multiply
   111.63x = 167.36 × 42.20
4. Step 4: Simplify right side
   111.63x = 7,062.59
5. Step 5: Solve for x
   x = 7,062.59/111.63
6. Step 6: Final answer
   x = 63.27