Finding the Fourth Proportional to 142.47, 196.56 and 90.03

Step by Step Solution

1. Step 1: Write the proportion equation
   142.47 : 196.56 = 90.03 : x
2. Step 2: Convert to fraction form
   142.47/196.56 = 90.03/x
3. Step 3: Cross multiply
   142.47x = 196.56 × 90.03
4. Step 4: Simplify right side
   142.47x = 17,696.30
5. Step 5: Solve for x
   x = 17,696.30/142.47
6. Step 6: Final answer
   x = 124.21