Finding the Fourth Proportional to 82.01, 123.02 and 81.71

Step by Step Solution

1. Step 1: Write the proportion equation
   82.01 : 123.02 = 81.71 : x
2. Step 2: Convert to fraction form
   82.01/123.02 = 81.71/x
3. Step 3: Cross multiply
   82.01x = 123.02 × 81.71
4. Step 4: Simplify right side
   82.01x = 10,050.94
5. Step 5: Solve for x
   x = 10,050.94/82.01
6. Step 6: Final answer
   x = 122.56