Finding the Fourth Proportional to 111.72, 154.15 and 67.44

Step by Step Solution

1. Step 1: Write the proportion equation
   111.72 : 154.15 = 67.44 : x
2. Step 2: Convert to fraction form
   111.72/154.15 = 67.44/x
3. Step 3: Cross multiply
   111.72x = 154.15 × 67.44
4. Step 4: Simplify right side
   111.72x = 10,395.88
5. Step 5: Solve for x
   x = 10,395.88/111.72
6. Step 6: Final answer
   x = 93.05