Finding the Fourth Proportional to 121.98, 182.88 and 67.89

Step by Step Solution

1. Step 1: Write the proportion equation
   121.98 : 182.88 = 67.89 : x
2. Step 2: Convert to fraction form
   121.98/182.88 = 67.89/x
3. Step 3: Cross multiply
   121.98x = 182.88 × 67.89
4. Step 4: Simplify right side
   121.98x = 12,415.72
5. Step 5: Solve for x
   x = 12,415.72/121.98
6. Step 6: Final answer
   x = 101.78