Finding the Fourth Proportional to 104.52, 144.09 and 89.94

Step by Step Solution

1. Step 1: Write the proportion equation
   104.52 : 144.09 = 89.94 : x
2. Step 2: Convert to fraction form
   104.52/144.09 = 89.94/x
3. Step 3: Cross multiply
   104.52x = 144.09 × 89.94
4. Step 4: Simplify right side
   104.52x = 12,959.45
5. Step 5: Solve for x
   x = 12,959.45/104.52
6. Step 6: Final answer
   x = 123.99