Finding the Fourth Proportional to 142.19, 196.22 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   142.19 : 196.22 = 83.98 : x
2. Step 2: Convert to fraction form
   142.19/196.22 = 83.98/x
3. Step 3: Cross multiply
   142.19x = 196.22 × 83.98
4. Step 4: Simplify right side
   142.19x = 16,477.78
5. Step 5: Solve for x
   x = 16,477.78/142.19
6. Step 6: Final answer
   x = 115.89