Finding the Fourth Proportional to 82.20, 112.83 and 72.94

Step by Step Solution

1. Step 1: Write the proportion equation
   82.20 : 112.83 = 72.94 : x
2. Step 2: Convert to fraction form
   82.20/112.83 = 72.94/x
3. Step 3: Cross multiply
   82.20x = 112.83 × 72.94
4. Step 4: Simplify right side
   82.20x = 8,229.82
5. Step 5: Solve for x
   x = 8,229.82/82.20
6. Step 6: Final answer
   x = 100.12