Finding the Fourth Proportional to 89.76, 124.02 and 86.52

Step by Step Solution

1. Step 1: Write the proportion equation
   89.76 : 124.02 = 86.52 : x
2. Step 2: Convert to fraction form
   89.76/124.02 = 86.52/x
3. Step 3: Cross multiply
   89.76x = 124.02 × 86.52
4. Step 4: Simplify right side
   89.76x = 10,730.21
5. Step 5: Solve for x
   x = 10,730.21/89.76
6. Step 6: Final answer
   x = 119.54