Finding the Fourth Proportional to 111.09, 165.99 and 104.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.09 : 165.99 = 104.10 : x
2. Step 2: Convert to fraction form
   111.09/165.99 = 104.10/x
3. Step 3: Cross multiply
   111.09x = 165.99 × 104.10
4. Step 4: Simplify right side
   111.09x = 17,279.56
5. Step 5: Solve for x
   x = 17,279.56/111.09
6. Step 6: Final answer
   x = 155.55