Finding the Fourth Proportional to 121.69, 167.94 and 72.59

Step by Step Solution

1. Step 1: Write the proportion equation
   121.69 : 167.94 = 72.59 : x
2. Step 2: Convert to fraction form
   121.69/167.94 = 72.59/x
3. Step 3: Cross multiply
   121.69x = 167.94 × 72.59
4. Step 4: Simplify right side
   121.69x = 12,190.76
5. Step 5: Solve for x
   x = 12,190.76/121.69
6. Step 6: Final answer
   x = 100.18