Finding the Fourth Proportional to 111.42, 153.50 and 105.93

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.50 = 105.93 : x
2. Step 2: Convert to fraction form
   111.42/153.50 = 105.93/x
3. Step 3: Cross multiply
   111.42x = 153.50 × 105.93
4. Step 4: Simplify right side
   111.42x = 16,259.73
5. Step 5: Solve for x
   x = 16,259.73/111.42
6. Step 6: Final answer
   x = 145.93