Finding the Fourth Proportional to 121.89, 182.82 and 56.88

Step by Step Solution

1. Step 1: Write the proportion equation
   121.89 : 182.82 = 56.88 : x
2. Step 2: Convert to fraction form
   121.89/182.82 = 56.88/x
3. Step 3: Cross multiply
   121.89x = 182.82 × 56.88
4. Step 4: Simplify right side
   121.89x = 10,397.89
5. Step 5: Solve for x
   x = 10,397.89/121.89
6. Step 6: Final answer
   x = 85.31