Finding the Fourth Proportional to 105.39, 157.89 and 74.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105.39 : 157.89 = 74.82 : x
2. Step 2: Convert to fraction form
   105.39/157.89 = 74.82/x
3. Step 3: Cross multiply
   105.39x = 157.89 × 74.82
4. Step 4: Simplify right side
   105.39x = 11,813.33
5. Step 5: Solve for x
   x = 11,813.33/105.39
6. Step 6: Final answer
   x = 112.09