Finding the Fourth Proportional to 113.58, 155.48 and 109.89

Step by Step Solution

1. Step 1: Write the proportion equation
   113.58 : 155.48 = 109.89 : x
2. Step 2: Convert to fraction form
   113.58/155.48 = 109.89/x
3. Step 3: Cross multiply
   113.58x = 155.48 × 109.89
4. Step 4: Simplify right side
   113.58x = 17,085.15
5. Step 5: Solve for x
   x = 17,085.15/113.58
6. Step 6: Final answer
   x = 150.42