Finding the Fourth Proportional to 105.62, 158.56 and 67.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105.62 : 158.56 = 67.18 : x
2. Step 2: Convert to fraction form
   105.62/158.56 = 67.18/x
3. Step 3: Cross multiply
   105.62x = 158.56 × 67.18
4. Step 4: Simplify right side
   105.62x = 10,652.06
5. Step 5: Solve for x
   x = 10,652.06/105.62
6. Step 6: Final answer
   x = 100.85