Finding the Fourth Proportional to 90.67, 124.59 and 86.65

Step by Step Solution

1. Step 1: Write the proportion equation
   90.67 : 124.59 = 86.65 : x
2. Step 2: Convert to fraction form
   90.67/124.59 = 86.65/x
3. Step 3: Cross multiply
   90.67x = 124.59 × 86.65
4. Step 4: Simplify right side
   90.67x = 10,795.72
5. Step 5: Solve for x
   x = 10,795.72/90.67
6. Step 6: Final answer
   x = 119.07