Finding the Fourth Proportional to 111.42, 153.75 and 67.80

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.75 = 67.80 : x
2. Step 2: Convert to fraction form
   111.42/153.75 = 67.80/x
3. Step 3: Cross multiply
   111.42x = 153.75 × 67.80
4. Step 4: Simplify right side
   111.42x = 10,424.25
5. Step 5: Solve for x
   x = 10,424.25/111.42
6. Step 6: Final answer
   x = 93.56