Finding the Fourth Proportional to 83.42, 124.89 and 82.81

Step by Step Solution

1. Step 1: Write the proportion equation
   83.42 : 124.89 = 82.81 : x
2. Step 2: Convert to fraction form
   83.42/124.89 = 82.81/x
3. Step 3: Cross multiply
   83.42x = 124.89 × 82.81
4. Step 4: Simplify right side
   83.42x = 10,342.14
5. Step 5: Solve for x
   x = 10,342.14/83.42
6. Step 6: Final answer
   x = 123.98