Finding the Fourth Proportional to 142.49, 196.62 and 83.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142.49 : 196.62 = 83.47 : x
2. Step 2: Convert to fraction form
   142.49/196.62 = 83.47/x
3. Step 3: Cross multiply
   142.49x = 196.62 × 83.47
4. Step 4: Simplify right side
   142.49x = 16,411.66
5. Step 5: Solve for x
   x = 16,411.66/142.49
6. Step 6: Final answer
   x = 115.18