Finding the Fourth Proportional to 90.43, 124.56 and 86.11

Step by Step Solution

1. Step 1: Write the proportion equation
   90.43 : 124.56 = 86.11 : x
2. Step 2: Convert to fraction form
   90.43/124.56 = 86.11/x
3. Step 3: Cross multiply
   90.43x = 124.56 × 86.11
4. Step 4: Simplify right side
   90.43x = 10,725.55
5. Step 5: Solve for x
   x = 10,725.55/90.43
6. Step 6: Final answer
   x = 118.61