Finding the Fourth Proportional to 142.21, 196.23 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142.21 : 196.23 = 83.98 : x
2. Step 2: Convert to fraction form
   142.21/196.23 = 83.98/x
3. Step 3: Cross multiply
   142.21x = 196.23 × 83.98
4. Step 4: Simplify right side
   142.21x = 16,479.40
5. Step 5: Solve for x
   x = 16,479.40/142.21
6. Step 6: Final answer
   x = 115.88