Finding the Fourth Proportional to 111.21, 153.51 and 67.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111.21 : 153.51 = 67.55 : x
2. Step 2: Convert to fraction form
   111.21/153.51 = 67.55/x
3. Step 3: Cross multiply
   111.21x = 153.51 × 67.55
4. Step 4: Simplify right side
   111.21x = 10,369.60
5. Step 5: Solve for x
   x = 10,369.60/111.21
6. Step 6: Final answer
   x = 93.24