Finding the Fourth Proportional to 144.42, 216.72 and 83.58

Step by Step Solution

1. Step 1: Write the proportion equation
   144.42 : 216.72 = 83.58 : x
2. Step 2: Convert to fraction form
   144.42/216.72 = 83.58/x
3. Step 3: Cross multiply
   144.42x = 216.72 × 83.58
4. Step 4: Simplify right side
   144.42x = 18,113.46
5. Step 5: Solve for x
   x = 18,113.46/144.42
6. Step 6: Final answer
   x = 125.42