Finding the Fourth Proportional to 90.62, 124.83 and 86.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90.62 : 124.83 = 86.30 : x
2. Step 2: Convert to fraction form
   90.62/124.83 = 86.30/x
3. Step 3: Cross multiply
   90.62x = 124.83 × 86.30
4. Step 4: Simplify right side
   90.62x = 10,772.20
5. Step 5: Solve for x
   x = 10,772.20/90.62
6. Step 6: Final answer
   x = 118.88