Finding the Fourth Proportional to 142.36, 196.52 and 109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142.36 : 196.52 = 109.72 : x
2. Step 2: Convert to fraction form
   142.36/196.52 = 109.72/x
3. Step 3: Cross multiply
   142.36x = 196.52 × 109.72
4. Step 4: Simplify right side
   142.36x = 21,562.17
5. Step 5: Solve for x
   x = 21,562.17/142.36
6. Step 6: Final answer
   x = 151.46