Finding the Fourth Proportional to 67.23, 100.68 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   67.23 : 100.68 = 42.78 : x
2. Step 2: Convert to fraction form
   67.23/100.68 = 42.78/x
3. Step 3: Cross multiply
   67.23x = 100.68 × 42.78
4. Step 4: Simplify right side
   67.23x = 4,306.88
5. Step 5: Solve for x
   x = 4,306.88/67.23
6. Step 6: Final answer
   x = 64.06