Finding the Fourth Proportional to 144.72, 199.58 and 89.42

Step by Step Solution

1. Step 1: Write the proportion equation
   144.72 : 199.58 = 89.42 : x
2. Step 2: Convert to fraction form
   144.72/199.58 = 89.42/x
3. Step 3: Cross multiply
   144.72x = 199.58 × 89.42
4. Step 4: Simplify right side
   144.72x = 17,845.00
5. Step 5: Solve for x
   x = 17,845.00/144.72
6. Step 6: Final answer
   x = 123.31