Finding the Fourth Proportional to 111.05, 166.42 and 50.09

Step by Step Solution

1. Step 1: Write the proportion equation
   111.05 : 166.42 = 50.09 : x
2. Step 2: Convert to fraction form
   111.05/166.42 = 50.09/x
3. Step 3: Cross multiply
   111.05x = 166.42 × 50.09
4. Step 4: Simplify right side
   111.05x = 8,335.98
5. Step 5: Solve for x
   x = 8,335.98/111.05
6. Step 6: Final answer
   x = 75.07