Finding the Fourth Proportional to 139.94, 209.83 and 48.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 209.83 = 48.61 : x
2. Step 2: Convert to fraction form
   139.94/209.83 = 48.61/x
3. Step 3: Cross multiply
   139.94x = 209.83 × 48.61
4. Step 4: Simplify right side
   139.94x = 10,198.79
5. Step 5: Solve for x
   x = 10,198.79/139.94
6. Step 6: Final answer
   x = 72.88