Finding the Fourth Proportional to 111.35, 153.69 and 67.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.35 : 153.69 = 67.12 : x
2. Step 2: Convert to fraction form
   111.35/153.69 = 67.12/x
3. Step 3: Cross multiply
   111.35x = 153.69 × 67.12
4. Step 4: Simplify right side
   111.35x = 10,314.57
5. Step 5: Solve for x
   x = 10,314.57/111.35
6. Step 6: Final answer
   x = 92.63