Finding the Fourth Proportional to 111.55, 166.41 and 111.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111.55 : 166.41 = 111.55 : x
2. Step 2: Convert to fraction form
   111.55/166.41 = 111.55/x
3. Step 3: Cross multiply
   111.55x = 166.41 × 111.55
4. Step 4: Simplify right side
   111.55x = 18,563.04
5. Step 5: Solve for x
   x = 18,563.04/111.55
6. Step 6: Final answer
   x = 166.41