Finding the Fourth Proportional to 82.28, 123.31 and 72.63

Step by Step Solution

1. Step 1: Write the proportion equation
   82.28 : 123.31 = 72.63 : x
2. Step 2: Convert to fraction form
   82.28/123.31 = 72.63/x
3. Step 3: Cross multiply
   82.28x = 123.31 × 72.63
4. Step 4: Simplify right side
   82.28x = 8,956.01
5. Step 5: Solve for x
   x = 8,956.01/82.28
6. Step 6: Final answer
   x = 108.85