Finding the Fourth Proportional to 105.45, 158.32 and 67.09

Step by Step Solution

1. Step 1: Write the proportion equation
   105.45 : 158.32 = 67.09 : x
2. Step 2: Convert to fraction form
   105.45/158.32 = 67.09/x
3. Step 3: Cross multiply
   105.45x = 158.32 × 67.09
4. Step 4: Simplify right side
   105.45x = 10,621.69
5. Step 5: Solve for x
   x = 10,621.69/105.45
6. Step 6: Final answer
   x = 100.73