Finding the Fourth Proportional to 89.67, 134.50 and 74.55

Step by Step Solution

1. Step 1: Write the proportion equation
   89.67 : 134.50 = 74.55 : x
2. Step 2: Convert to fraction form
   89.67/134.50 = 74.55/x
3. Step 3: Cross multiply
   89.67x = 134.50 × 74.55
4. Step 4: Simplify right side
   89.67x = 10,026.98
5. Step 5: Solve for x
   x = 10,026.98/89.67
6. Step 6: Final answer
   x = 111.82