Finding the Fourth Proportional to 111.56, 153.90 and 67.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.90 = 67.28 : x
2. Step 2: Convert to fraction form
   111.56/153.90 = 67.28/x
3. Step 3: Cross multiply
   111.56x = 153.90 × 67.28
4. Step 4: Simplify right side
   111.56x = 10,354.39
5. Step 5: Solve for x
   x = 10,354.39/111.56
6. Step 6: Final answer
   x = 92.81