Finding the Fourth Proportional to 82.88, 123.76 and 80.96

Step by Step Solution

1. Step 1: Write the proportion equation
   82.88 : 123.76 = 80.96 : x
2. Step 2: Convert to fraction form
   82.88/123.76 = 80.96/x
3. Step 3: Cross multiply
   82.88x = 123.76 × 80.96
4. Step 4: Simplify right side
   82.88x = 10,019.61
5. Step 5: Solve for x
   x = 10,019.61/82.88
6. Step 6: Final answer
   x = 120.89