Finding the Fourth Proportional to 105.57, 158.18 and 64.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105.57 : 158.18 = 64.96 : x
2. Step 2: Convert to fraction form
   105.57/158.18 = 64.96/x
3. Step 3: Cross multiply
   105.57x = 158.18 × 64.96
4. Step 4: Simplify right side
   105.57x = 10,274.65
5. Step 5: Solve for x
   x = 10,274.65/105.57
6. Step 6: Final answer
   x = 97.33