Finding the Fourth Proportional to 105.69, 158.61 and 67.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105.69 : 158.61 = 67.07 : x
2. Step 2: Convert to fraction form
   105.69/158.61 = 67.07/x
3. Step 3: Cross multiply
   105.69x = 158.61 × 67.07
4. Step 4: Simplify right side
   105.69x = 10,638.56
5. Step 5: Solve for x
   x = 10,638.56/105.69
6. Step 6: Final answer
   x = 100.66