Finding the Fourth Proportional to 142.49, 196.49 and 109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   142.49 : 196.49 = 109.69 : x
2. Step 2: Convert to fraction form
   142.49/196.49 = 109.69/x
3. Step 3: Cross multiply
   142.49x = 196.49 × 109.69
4. Step 4: Simplify right side
   142.49x = 21,552.77
5. Step 5: Solve for x
   x = 21,552.77/142.49
6. Step 6: Final answer
   x = 151.26