Finding the Fourth Proportional to 82.81, 123.49 and 82.08

Step by Step Solution

1. Step 1: Write the proportion equation
   82.81 : 123.49 = 82.08 : x
2. Step 2: Convert to fraction form
   82.81/123.49 = 82.08/x
3. Step 3: Cross multiply
   82.81x = 123.49 × 82.08
4. Step 4: Simplify right side
   82.81x = 10,136.06
5. Step 5: Solve for x
   x = 10,136.06/82.81
6. Step 6: Final answer
   x = 122.40