Finding the Fourth Proportional to 111.41, 153.77 and 67.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.41 : 153.77 = 67.78 : x
2. Step 2: Convert to fraction form
   111.41/153.77 = 67.78/x
3. Step 3: Cross multiply
   111.41x = 153.77 × 67.78
4. Step 4: Simplify right side
   111.41x = 10,422.53
5. Step 5: Solve for x
   x = 10,422.53/111.41
6. Step 6: Final answer
   x = 93.55