Finding the Fourth Proportional to 92.42, 138.89 and 82.42

Step by Step Solution

1. Step 1: Write the proportion equation
   92.42 : 138.89 = 82.42 : x
2. Step 2: Convert to fraction form
   92.42/138.89 = 82.42/x
3. Step 3: Cross multiply
   92.42x = 138.89 × 82.42
4. Step 4: Simplify right side
   92.42x = 11,447.31
5. Step 5: Solve for x
   x = 11,447.31/92.42
6. Step 6: Final answer
   x = 123.86