Finding the Fourth Proportional to 112.05, 168.12 and 60.72

Step by Step Solution

1. Step 1: Write the proportion equation
   112.05 : 168.12 = 60.72 : x
2. Step 2: Convert to fraction form
   112.05/168.12 = 60.72/x
3. Step 3: Cross multiply
   112.05x = 168.12 × 60.72
4. Step 4: Simplify right side
   112.05x = 10,208.25
5. Step 5: Solve for x
   x = 10,208.25/112.05
6. Step 6: Final answer
   x = 91.10