Finding the Fourth Proportional to 90.26, 123.86 and 82.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.26 : 123.86 = 82.05 : x
2. Step 2: Convert to fraction form
   90.26/123.86 = 82.05/x
3. Step 3: Cross multiply
   90.26x = 123.86 × 82.05
4. Step 4: Simplify right side
   90.26x = 10,162.30
5. Step 5: Solve for x
   x = 10,162.30/90.26
6. Step 6: Final answer
   x = 112.60