Finding the Fourth Proportional to 111.42, 153.68 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.68 = 67.78 : x
2. Step 2: Convert to fraction form
   111.42/153.68 = 67.78/x
3. Step 3: Cross multiply
   111.42x = 153.68 × 67.78
4. Step 4: Simplify right side
   111.42x = 10,416.22
5. Step 5: Solve for x
   x = 10,416.22/111.42
6. Step 6: Final answer
   x = 93.49