Finding the Fourth Proportional to 122.37, 168.89 and 72.59

Step by Step Solution

1. Step 1: Write the proportion equation
   122.37 : 168.89 = 72.59 : x
2. Step 2: Convert to fraction form
   122.37/168.89 = 72.59/x
3. Step 3: Cross multiply
   122.37x = 168.89 × 72.59
4. Step 4: Simplify right side
   122.37x = 12,258.52
5. Step 5: Solve for x
   x = 12,258.52/122.37
6. Step 6: Final answer
   x = 100.18