Finding the Fourth Proportional to 89.68, 134.50 and 74.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89.68 : 134.50 = 74.56 : x
2. Step 2: Convert to fraction form
   89.68/134.50 = 74.56/x
3. Step 3: Cross multiply
   89.68x = 134.50 × 74.56
4. Step 4: Simplify right side
   89.68x = 10,027.27
5. Step 5: Solve for x
   x = 10,027.27/89.68
6. Step 6: Final answer
   x = 111.82