Finding the Fourth Proportional to 82.71, 113.79 and 72.83

Step by Step Solution

1. Step 1: Write the proportion equation
   82.71 : 113.79 = 72.83 : x
2. Step 2: Convert to fraction form
   82.71/113.79 = 72.83/x
3. Step 3: Cross multiply
   82.71x = 113.79 × 72.83
4. Step 4: Simplify right side
   82.71x = 8,287.33
5. Step 5: Solve for x
   x = 8,287.33/82.71
6. Step 6: Final answer
   x = 100.20