Finding the Fourth Proportional to 139.72, 209.56 and 48.41

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 209.56 = 48.41 : x
2. Step 2: Convert to fraction form
   139.72/209.56 = 48.41/x
3. Step 3: Cross multiply
   139.72x = 209.56 × 48.41
4. Step 4: Simplify right side
   139.72x = 10,144.80
5. Step 5: Solve for x
   x = 10,144.80/139.72
6. Step 6: Final answer
   x = 72.61