Finding the Fourth Proportional to 83.98, 125.27 and 82.15

Step by Step Solution

1. Step 1: Write the proportion equation
   83.98 : 125.27 = 82.15 : x
2. Step 2: Convert to fraction form
   83.98/125.27 = 82.15/x
3. Step 3: Cross multiply
   83.98x = 125.27 × 82.15
4. Step 4: Simplify right side
   83.98x = 10,290.93
5. Step 5: Solve for x
   x = 10,290.93/83.98
6. Step 6: Final answer
   x = 122.54