Finding the Fourth Proportional to 111.52, 153.98 and 105.74

Step by Step Solution

1. Step 1: Write the proportion equation
   111.52 : 153.98 = 105.74 : x
2. Step 2: Convert to fraction form
   111.52/153.98 = 105.74/x
3. Step 3: Cross multiply
   111.52x = 153.98 × 105.74
4. Step 4: Simplify right side
   111.52x = 16,281.32
5. Step 5: Solve for x
   x = 16,281.32/111.52
6. Step 6: Final answer
   x = 146.00