Finding the Fourth Proportional to 142.26, 196.42 and 105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142.26 : 196.42 = 105.50 : x
2. Step 2: Convert to fraction form
   142.26/196.42 = 105.50/x
3. Step 3: Cross multiply
   142.26x = 196.42 × 105.50
4. Step 4: Simplify right side
   142.26x = 20,722.31
5. Step 5: Solve for x
   x = 20,722.31/142.26
6. Step 6: Final answer
   x = 145.67