Finding the Fourth Proportional to 111.43, 153.72 and 67.79

Step by Step Solution

1. Step 1: Write the proportion equation
   111.43 : 153.72 = 67.79 : x
2. Step 2: Convert to fraction form
   111.43/153.72 = 67.79/x
3. Step 3: Cross multiply
   111.43x = 153.72 × 67.79
4. Step 4: Simplify right side
   111.43x = 10,420.39
5. Step 5: Solve for x
   x = 10,420.39/111.43
6. Step 6: Final answer
   x = 93.52