Finding the Fourth Proportional to 90.52, 124.94 and 86.18

Step by Step Solution

1. Step 1: Write the proportion equation
   90.52 : 124.94 = 86.18 : x
2. Step 2: Convert to fraction form
   90.52/124.94 = 86.18/x
3. Step 3: Cross multiply
   90.52x = 124.94 × 86.18
4. Step 4: Simplify right side
   90.52x = 10,767.33
5. Step 5: Solve for x
   x = 10,767.33/90.52
6. Step 6: Final answer
   x = 118.95