Finding the Fourth Proportional to 105.49, 157.95 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105.49 : 157.95 = 64.72 : x
2. Step 2: Convert to fraction form
   105.49/157.95 = 64.72/x
3. Step 3: Cross multiply
   105.49x = 157.95 × 64.72
4. Step 4: Simplify right side
   105.49x = 10,222.52
5. Step 5: Solve for x
   x = 10,222.52/105.49
6. Step 6: Final answer
   x = 96.91