Finding the Fourth Proportional to 139.83, 209.75 and 48.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.83 : 209.75 = 48.50 : x
2. Step 2: Convert to fraction form
   139.83/209.75 = 48.50/x
3. Step 3: Cross multiply
   139.83x = 209.75 × 48.50
4. Step 4: Simplify right side
   139.83x = 10,172.88
5. Step 5: Solve for x
   x = 10,172.88/139.83
6. Step 6: Final answer
   x = 72.75