Finding the Fourth Proportional to 82.30, 124.16 and 80.62

Step by Step Solution

1. Step 1: Write the proportion equation
   82.30 : 124.16 = 80.62 : x
2. Step 2: Convert to fraction form
   82.30/124.16 = 80.62/x
3. Step 3: Cross multiply
   82.30x = 124.16 × 80.62
4. Step 4: Simplify right side
   82.30x = 10,009.78
5. Step 5: Solve for x
   x = 10,009.78/82.30
6. Step 6: Final answer
   x = 121.63