Finding the Fourth Proportional to 103.32, 142.59 and 89.49

Step by Step Solution

1. Step 1: Write the proportion equation
   103.32 : 142.59 = 89.49 : x
2. Step 2: Convert to fraction form
   103.32/142.59 = 89.49/x
3. Step 3: Cross multiply
   103.32x = 142.59 × 89.49
4. Step 4: Simplify right side
   103.32x = 12,760.38
5. Step 5: Solve for x
   x = 12,760.38/103.32
6. Step 6: Final answer
   x = 123.50