Finding the Fourth Proportional to 146.42, 218.71 and 143.72

Step by Step Solution

1. Step 1: Write the proportion equation
   146.42 : 218.71 = 143.72 : x
2. Step 2: Convert to fraction form
   146.42/218.71 = 143.72/x
3. Step 3: Cross multiply
   146.42x = 218.71 × 143.72
4. Step 4: Simplify right side
   146.42x = 31,433.00
5. Step 5: Solve for x
   x = 31,433.00/146.42
6. Step 6: Final answer
   x = 214.68