Finding the Fourth Proportional to 111.77, 168.51 and 103.94

Step by Step Solution

1. Step 1: Write the proportion equation
   111.77 : 168.51 = 103.94 : x
2. Step 2: Convert to fraction form
   111.77/168.51 = 103.94/x
3. Step 3: Cross multiply
   111.77x = 168.51 × 103.94
4. Step 4: Simplify right side
   111.77x = 17,515.35
5. Step 5: Solve for x
   x = 17,515.35/111.77
6. Step 6: Final answer
   x = 156.71