Finding the Fourth Proportional to 89.58, 134.18 and 74.38

Step by Step Solution

1. Step 1: Write the proportion equation
   89.58 : 134.18 = 74.38 : x
2. Step 2: Convert to fraction form
   89.58/134.18 = 74.38/x
3. Step 3: Cross multiply
   89.58x = 134.18 × 74.38
4. Step 4: Simplify right side
   89.58x = 9,980.31
5. Step 5: Solve for x
   x = 9,980.31/89.58
6. Step 6: Final answer
   x = 111.41