Finding the Fourth Proportional to 89.41, 124.15 and 88.69

Step by Step Solution

1. Step 1: Write the proportion equation
   89.41 : 124.15 = 88.69 : x
2. Step 2: Convert to fraction form
   89.41/124.15 = 88.69/x
3. Step 3: Cross multiply
   89.41x = 124.15 × 88.69
4. Step 4: Simplify right side
   89.41x = 11,010.86
5. Step 5: Solve for x
   x = 11,010.86/89.41
6. Step 6: Final answer
   x = 123.15