Finding the Fourth Proportional to 142.58, 196.73 and 109.43

Step by Step Solution

1. Step 1: Write the proportion equation
   142.58 : 196.73 = 109.43 : x
2. Step 2: Convert to fraction form
   142.58/196.73 = 109.43/x
3. Step 3: Cross multiply
   142.58x = 196.73 × 109.43
4. Step 4: Simplify right side
   142.58x = 21,527.45
5. Step 5: Solve for x
   x = 21,527.45/142.58
6. Step 6: Final answer
   x = 150.98