Finding the Fourth Proportional to 111.38, 153.70 and 67.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.70 = 67.72 : x
2. Step 2: Convert to fraction form
   111.38/153.70 = 67.72/x
3. Step 3: Cross multiply
   111.38x = 153.70 × 67.72
4. Step 4: Simplify right side
   111.38x = 10,408.30
5. Step 5: Solve for x
   x = 10,408.30/111.38
6. Step 6: Final answer
   x = 93.45