Finding the Fourth Proportional to 142.56, 212.47 and 141.37

Step by Step Solution

1. Step 1: Write the proportion equation
   142.56 : 212.47 = 141.37 : x
2. Step 2: Convert to fraction form
   142.56/212.47 = 141.37/x
3. Step 3: Cross multiply
   142.56x = 212.47 × 141.37
4. Step 4: Simplify right side
   142.56x = 30,036.00
5. Step 5: Solve for x
   x = 30,036.00/142.56
6. Step 6: Final answer
   x = 210.69