Finding the Fourth Proportional to 111.98, 154.59 and 79.45

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.59 = 79.45 : x
2. Step 2: Convert to fraction form
   111.98/154.59 = 79.45/x
3. Step 3: Cross multiply
   111.98x = 154.59 × 79.45
4. Step 4: Simplify right side
   111.98x = 12,282.18
5. Step 5: Solve for x
   x = 12,282.18/111.98
6. Step 6: Final answer
   x = 109.68