Finding the Fourth Proportional to 83.03, 123.79 and 80.89

Step by Step Solution

1. Step 1: Write the proportion equation
   83.03 : 123.79 = 80.89 : x
2. Step 2: Convert to fraction form
   83.03/123.79 = 80.89/x
3. Step 3: Cross multiply
   83.03x = 123.79 × 80.89
4. Step 4: Simplify right side
   83.03x = 10,012.86
5. Step 5: Solve for x
   x = 10,012.86/83.03
6. Step 6: Final answer
   x = 120.60