Finding the Fourth Proportional to 105.96, 158.76 and 65.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105.96 : 158.76 = 65.40 : x
2. Step 2: Convert to fraction form
   105.96/158.76 = 65.40/x
3. Step 3: Cross multiply
   105.96x = 158.76 × 65.40
4. Step 4: Simplify right side
   105.96x = 10,382.90
5. Step 5: Solve for x
   x = 10,382.90/105.96
6. Step 6: Final answer
   x = 97.99