Finding the Fourth Proportional to 111.48, 153.62 and 105.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.48 : 153.62 = 105.62 : x
2. Step 2: Convert to fraction form
   111.48/153.62 = 105.62/x
3. Step 3: Cross multiply
   111.48x = 153.62 × 105.62
4. Step 4: Simplify right side
   111.48x = 16,225.34
5. Step 5: Solve for x
   x = 16,225.34/111.48
6. Step 6: Final answer
   x = 145.54