Finding the Fourth Proportional to 90.11, 123.59 and 86.06

Step by Step Solution

1. Step 1: Write the proportion equation
   90.11 : 123.59 = 86.06 : x
2. Step 2: Convert to fraction form
   90.11/123.59 = 86.06/x
3. Step 3: Cross multiply
   90.11x = 123.59 × 86.06
4. Step 4: Simplify right side
   90.11x = 10,636.68
5. Step 5: Solve for x
   x = 10,636.68/90.11
6. Step 6: Final answer
   x = 118.04