Finding the Fourth Proportional to 82.82, 123.63 and 72.55

Step by Step Solution

1. Step 1: Write the proportion equation
   82.82 : 123.63 = 72.55 : x
2. Step 2: Convert to fraction form
   82.82/123.63 = 72.55/x
3. Step 3: Cross multiply
   82.82x = 123.63 × 72.55
4. Step 4: Simplify right side
   82.82x = 8,968.54
5. Step 5: Solve for x
   x = 8,968.54/82.82
6. Step 6: Final answer
   x = 108.29