Finding the Fourth Proportional to 190.56, 285.72 and 105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   190.56 : 285.72 = 105.12 : x
2. Step 2: Convert to fraction form
   190.56/285.72 = 105.12/x
3. Step 3: Cross multiply
   190.56x = 285.72 × 105.12
4. Step 4: Simplify right side
   190.56x = 30,034.89
5. Step 5: Solve for x
   x = 30,034.89/190.56
6. Step 6: Final answer
   x = 157.61