Finding the Fourth Proportional to 105.62, 158.54 and 65.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105.62 : 158.54 = 65.15 : x
2. Step 2: Convert to fraction form
   105.62/158.54 = 65.15/x
3. Step 3: Cross multiply
   105.62x = 158.54 × 65.15
4. Step 4: Simplify right side
   105.62x = 10,328.25
5. Step 5: Solve for x
   x = 10,328.25/105.62
6. Step 6: Final answer
   x = 97.78