Finding the Fourth Proportional to 111.21, 153.45 and 67.53

Step by Step Solution

1. Step 1: Write the proportion equation
   111.21 : 153.45 = 67.53 : x
2. Step 2: Convert to fraction form
   111.21/153.45 = 67.53/x
3. Step 3: Cross multiply
   111.21x = 153.45 × 67.53
4. Step 4: Simplify right side
   111.21x = 10,362.48
5. Step 5: Solve for x
   x = 10,362.48/111.21
6. Step 6: Final answer
   x = 93.18