Finding the Fourth Proportional to 142.57, 196.72 and 83.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142.57 : 196.72 = 83.56 : x
2. Step 2: Convert to fraction form
   142.57/196.72 = 83.56/x
3. Step 3: Cross multiply
   142.57x = 196.72 × 83.56
4. Step 4: Simplify right side
   142.57x = 16,437.22
5. Step 5: Solve for x
   x = 16,437.22/142.57
6. Step 6: Final answer
   x = 115.29