Finding the Fourth Proportional to 144.72, 199.73 and 89.51

Step by Step Solution

1. Step 1: Write the proportion equation
   144.72 : 199.73 = 89.51 : x
2. Step 2: Convert to fraction form
   144.72/199.73 = 89.51/x
3. Step 3: Cross multiply
   144.72x = 199.73 × 89.51
4. Step 4: Simplify right side
   144.72x = 17,877.06
5. Step 5: Solve for x
   x = 17,877.06/144.72
6. Step 6: Final answer
   x = 123.53