Finding the Fourth Proportional to 105.59, 158.15 and 64.89

Step by Step Solution

1. Step 1: Write the proportion equation
   105.59 : 158.15 = 64.89 : x
2. Step 2: Convert to fraction form
   105.59/158.15 = 64.89/x
3. Step 3: Cross multiply
   105.59x = 158.15 × 64.89
4. Step 4: Simplify right side
   105.59x = 10,262.12
5. Step 5: Solve for x
   x = 10,262.12/105.59
6. Step 6: Final answer
   x = 97.19