Finding the Fourth Proportional to 105.90, 158.74 and 67.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105.90 : 158.74 = 67.42 : x
2. Step 2: Convert to fraction form
   105.90/158.74 = 67.42/x
3. Step 3: Cross multiply
   105.90x = 158.74 × 67.42
4. Step 4: Simplify right side
   105.90x = 10,702.25
5. Step 5: Solve for x
   x = 10,702.25/105.90
6. Step 6: Final answer
   x = 101.06