Finding the Fourth Proportional to 105.72, 158.49 and 60.03

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 158.49 = 60.03 : x
2. Step 2: Convert to fraction form
   105.72/158.49 = 60.03/x
3. Step 3: Cross multiply
   105.72x = 158.49 × 60.03
4. Step 4: Simplify right side
   105.72x = 9,514.15
5. Step 5: Solve for x
   x = 9,514.15/105.72
6. Step 6: Final answer
   x = 89.99