Finding the Fourth Proportional to 111.98, 154.32 and 103.25

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.32 = 103.25 : x
2. Step 2: Convert to fraction form
   111.98/154.32 = 103.25/x
3. Step 3: Cross multiply
   111.98x = 154.32 × 103.25
4. Step 4: Simplify right side
   111.98x = 15,932.77
5. Step 5: Solve for x
   x = 15,932.77/111.98
6. Step 6: Final answer
   x = 142.29