Finding the Fourth Proportional to 90.16, 124.56 and 82.06

Step by Step Solution

1. Step 1: Write the proportion equation
   90.16 : 124.56 = 82.06 : x
2. Step 2: Convert to fraction form
   90.16/124.56 = 82.06/x
3. Step 3: Cross multiply
   90.16x = 124.56 × 82.06
4. Step 4: Simplify right side
   90.16x = 10,221.39
5. Step 5: Solve for x
   x = 10,221.39/90.16
6. Step 6: Final answer
   x = 113.37