Finding the Fourth Proportional to 89.42, 123.24 and 87.86

Step by Step Solution

1. Step 1: Write the proportion equation
   89.42 : 123.24 = 87.86 : x
2. Step 2: Convert to fraction form
   89.42/123.24 = 87.86/x
3. Step 3: Cross multiply
   89.42x = 123.24 × 87.86
4. Step 4: Simplify right side
   89.42x = 10,827.87
5. Step 5: Solve for x
   x = 10,827.87/89.42
6. Step 6: Final answer
   x = 121.09