Finding the Fourth Proportional to 105.40, 158.16 and 69.35

Step by Step Solution

1. Step 1: Write the proportion equation
   105.40 : 158.16 = 69.35 : x
2. Step 2: Convert to fraction form
   105.40/158.16 = 69.35/x
3. Step 3: Cross multiply
   105.40x = 158.16 × 69.35
4. Step 4: Simplify right side
   105.40x = 10,968.40
5. Step 5: Solve for x
   x = 10,968.40/105.40
6. Step 6: Final answer
   x = 104.07