Finding the Fourth Proportional to 82.74, 123.50 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   82.74 : 123.50 = 72.48 : x
2. Step 2: Convert to fraction form
   82.74/123.50 = 72.48/x
3. Step 3: Cross multiply
   82.74x = 123.50 × 72.48
4. Step 4: Simplify right side
   82.74x = 8,951.92
5. Step 5: Solve for x
   x = 8,951.92/82.74
6. Step 6: Final answer
   x = 108.19