Finding the Fourth Proportional to 111.53, 153.93 and 67.89

Step by Step Solution

1. Step 1: Write the proportion equation
   111.53 : 153.93 = 67.89 : x
2. Step 2: Convert to fraction form
   111.53/153.93 = 67.89/x
3. Step 3: Cross multiply
   111.53x = 153.93 × 67.89
4. Step 4: Simplify right side
   111.53x = 10,450.31
5. Step 5: Solve for x
   x = 10,450.31/111.53
6. Step 6: Final answer
   x = 93.70