Finding the Fourth Proportional to 105.86, 158.82 and 67.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105.86 : 158.82 = 67.40 : x
2. Step 2: Convert to fraction form
   105.86/158.82 = 67.40/x
3. Step 3: Cross multiply
   105.86x = 158.82 × 67.40
4. Step 4: Simplify right side
   105.86x = 10,704.47
5. Step 5: Solve for x
   x = 10,704.47/105.86
6. Step 6: Final answer
   x = 101.12