Finding the Fourth Proportional to 111.29, 153.60 and 67.05

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 153.60 = 67.05 : x
2. Step 2: Convert to fraction form
   111.29/153.60 = 67.05/x
3. Step 3: Cross multiply
   111.29x = 153.60 × 67.05
4. Step 4: Simplify right side
   111.29x = 10,298.88
5. Step 5: Solve for x
   x = 10,298.88/111.29
6. Step 6: Final answer
   x = 92.55