Finding the Fourth Proportional to 142.51, 196.69 and 83.51

Step by Step Solution

1. Step 1: Write the proportion equation
   142.51 : 196.69 = 83.51 : x
2. Step 2: Convert to fraction form
   142.51/196.69 = 83.51/x
3. Step 3: Cross multiply
   142.51x = 196.69 × 83.51
4. Step 4: Simplify right side
   142.51x = 16,424.60
5. Step 5: Solve for x
   x = 16,424.60/142.51
6. Step 6: Final answer
   x = 115.25