Finding the Fourth Proportional to 111.91, 167.89 and 42.51

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 167.89 = 42.51 : x
2. Step 2: Convert to fraction form
   111.91/167.89 = 42.51/x
3. Step 3: Cross multiply
   111.91x = 167.89 × 42.51
4. Step 4: Simplify right side
   111.91x = 7,137.00
5. Step 5: Solve for x
   x = 7,137.00/111.91
6. Step 6: Final answer
   x = 63.77