Finding the Fourth Proportional to 90.25, 123.71 and 90.09

Step by Step Solution

1. Step 1: Write the proportion equation
   90.25 : 123.71 = 90.09 : x
2. Step 2: Convert to fraction form
   90.25/123.71 = 90.09/x
3. Step 3: Cross multiply
   90.25x = 123.71 × 90.09
4. Step 4: Simplify right side
   90.25x = 11,145.03
5. Step 5: Solve for x
   x = 11,145.03/90.25
6. Step 6: Final answer
   x = 123.49