Finding the Fourth Proportional to 139.88, 209.83 and 48.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139.88 : 209.83 = 48.55 : x
2. Step 2: Convert to fraction form
   139.88/209.83 = 48.55/x
3. Step 3: Cross multiply
   139.88x = 209.83 × 48.55
4. Step 4: Simplify right side
   139.88x = 10,187.25
5. Step 5: Solve for x
   x = 10,187.25/139.88
6. Step 6: Final answer
   x = 72.83