Finding the Fourth Proportional to 142.43, 196.49 and 89.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142.43 : 196.49 = 89.98 : x
2. Step 2: Convert to fraction form
   142.43/196.49 = 89.98/x
3. Step 3: Cross multiply
   142.43x = 196.49 × 89.98
4. Step 4: Simplify right side
   142.43x = 17,679.90
5. Step 5: Solve for x
   x = 17,679.90/142.43
6. Step 6: Final answer
   x = 124.13