Finding the Fourth Proportional to 111.15, 165.61 and 104.94

Step by Step Solution

1. Step 1: Write the proportion equation
   111.15 : 165.61 = 104.94 : x
2. Step 2: Convert to fraction form
   111.15/165.61 = 104.94/x
3. Step 3: Cross multiply
   111.15x = 165.61 × 104.94
4. Step 4: Simplify right side
   111.15x = 17,378.59
5. Step 5: Solve for x
   x = 17,378.59/111.15
6. Step 6: Final answer
   x = 156.35