Finding the Fourth Proportional to 67.26, 100.68 and 42.87

Step by Step Solution

1. Step 1: Write the proportion equation
   67.26 : 100.68 = 42.87 : x
2. Step 2: Convert to fraction form
   67.26/100.68 = 42.87/x
3. Step 3: Cross multiply
   67.26x = 100.68 × 42.87
4. Step 4: Simplify right side
   67.26x = 4,316.15
5. Step 5: Solve for x
   x = 4,316.15/67.26
6. Step 6: Final answer
   x = 64.17