Finding the Fourth Proportional to 82.99, 123.67 and 80.92

Step by Step Solution

1. Step 1: Write the proportion equation
   82.99 : 123.67 = 80.92 : x
2. Step 2: Convert to fraction form
   82.99/123.67 = 80.92/x
3. Step 3: Cross multiply
   82.99x = 123.67 × 80.92
4. Step 4: Simplify right side
   82.99x = 10,007.38
5. Step 5: Solve for x
   x = 10,007.38/82.99
6. Step 6: Final answer
   x = 120.59