Finding the Fourth Proportional to 121.52, 167.58 and 100.82

Step by Step Solution

1. Step 1: Write the proportion equation
   121.52 : 167.58 = 100.82 : x
2. Step 2: Convert to fraction form
   121.52/167.58 = 100.82/x
3. Step 3: Cross multiply
   121.52x = 167.58 × 100.82
4. Step 4: Simplify right side
   121.52x = 16,895.42
5. Step 5: Solve for x
   x = 16,895.42/121.52
6. Step 6: Final answer
   x = 139.03