Finding the Fourth Proportional to 89.69, 123.62 and 74.88

Step by Step Solution

1. Step 1: Write the proportion equation
   89.69 : 123.62 = 74.88 : x
2. Step 2: Convert to fraction form
   89.69/123.62 = 74.88/x
3. Step 3: Cross multiply
   89.69x = 123.62 × 74.88
4. Step 4: Simplify right side
   89.69x = 9,256.80
5. Step 5: Solve for x
   x = 9,256.80/89.69
6. Step 6: Final answer
   x = 103.21