Finding the Fourth Proportional to 82.98, 124.29 and 80.55

Step by Step Solution

1. Step 1: Write the proportion equation
   82.98 : 124.29 = 80.55 : x
2. Step 2: Convert to fraction form
   82.98/124.29 = 80.55/x
3. Step 3: Cross multiply
   82.98x = 124.29 × 80.55
4. Step 4: Simplify right side
   82.98x = 10,011.56
5. Step 5: Solve for x
   x = 10,011.56/82.98
6. Step 6: Final answer
   x = 120.65