Finding the Fourth Proportional to 111.78, 166.83 and 104.07

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 166.83 = 104.07 : x
2. Step 2: Convert to fraction form
   111.78/166.83 = 104.07/x
3. Step 3: Cross multiply
   111.78x = 166.83 × 104.07
4. Step 4: Simplify right side
   111.78x = 17,362.00
5. Step 5: Solve for x
   x = 17,362.00/111.78
6. Step 6: Final answer
   x = 155.32