Finding the Fourth Proportional to 105.49, 158.15 and 64.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105.49 : 158.15 = 64.82 : x
2. Step 2: Convert to fraction form
   105.49/158.15 = 64.82/x
3. Step 3: Cross multiply
   105.49x = 158.15 × 64.82
4. Step 4: Simplify right side
   105.49x = 10,250.96
5. Step 5: Solve for x
   x = 10,250.96/105.49
6. Step 6: Final answer
   x = 97.18