Finding the Fourth Proportional to 111.43, 153.78 and 67.76

Step by Step Solution

1. Step 1: Write the proportion equation
   111.43 : 153.78 = 67.76 : x
2. Step 2: Convert to fraction form
   111.43/153.78 = 67.76/x
3. Step 3: Cross multiply
   111.43x = 153.78 × 67.76
4. Step 4: Simplify right side
   111.43x = 10,420.13
5. Step 5: Solve for x
   x = 10,420.13/111.43
6. Step 6: Final answer
   x = 93.52