Finding the Fourth Proportional to 142.62, 196.76 and 90.22

Step by Step Solution

1. Step 1: Write the proportion equation
   142.62 : 196.76 = 90.22 : x
2. Step 2: Convert to fraction form
   142.62/196.76 = 90.22/x
3. Step 3: Cross multiply
   142.62x = 196.76 × 90.22
4. Step 4: Simplify right side
   142.62x = 17,751.69
5. Step 5: Solve for x
   x = 17,751.69/142.62
6. Step 6: Final answer
   x = 124.47