Finding the Fourth Proportional to 89.72, 123.72 and 74.96

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 123.72 = 74.96 : x
2. Step 2: Convert to fraction form
   89.72/123.72 = 74.96/x
3. Step 3: Cross multiply
   89.72x = 123.72 × 74.96
4. Step 4: Simplify right side
   89.72x = 9,274.05
5. Step 5: Solve for x
   x = 9,274.05/89.72
6. Step 6: Final answer
   x = 103.37