Finding the Fourth Proportional to 90.42, 124.77 and 82.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.42 : 124.77 = 82.05 : x
2. Step 2: Convert to fraction form
   90.42/124.77 = 82.05/x
3. Step 3: Cross multiply
   90.42x = 124.77 × 82.05
4. Step 4: Simplify right side
   90.42x = 10,237.38
5. Step 5: Solve for x
   x = 10,237.38/90.42
6. Step 6: Final answer
   x = 113.22