Finding the Fourth Proportional to 142.25, 196.41 and 105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142.25 : 196.41 = 105.50 : x
2. Step 2: Convert to fraction form
   142.25/196.41 = 105.50/x
3. Step 3: Cross multiply
   142.25x = 196.41 × 105.50
4. Step 4: Simplify right side
   142.25x = 20,721.26
5. Step 5: Solve for x
   x = 20,721.26/142.25
6. Step 6: Final answer
   x = 145.67