Finding the Fourth Proportional to 112.48, 168.72 and 64.42

Step by Step Solution

1. Step 1: Write the proportion equation
   112.48 : 168.72 = 64.42 : x
2. Step 2: Convert to fraction form
   112.48/168.72 = 64.42/x
3. Step 3: Cross multiply
   112.48x = 168.72 × 64.42
4. Step 4: Simplify right side
   112.48x = 10,868.94
5. Step 5: Solve for x
   x = 10,868.94/112.48
6. Step 6: Final answer
   x = 96.63