Finding the Fourth Proportional to 111.63, 168.49 and 111.63

Step by Step Solution

1. Step 1: Write the proportion equation
   111.63 : 168.49 = 111.63 : x
2. Step 2: Convert to fraction form
   111.63/168.49 = 111.63/x
3. Step 3: Cross multiply
   111.63x = 168.49 × 111.63
4. Step 4: Simplify right side
   111.63x = 18,808.36
5. Step 5: Solve for x
   x = 18,808.36/111.63
6. Step 6: Final answer
   x = 168.49