Finding the Fourth Proportional to 139.54, 209.31 and 48.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139.54 : 209.31 = 48.25 : x
2. Step 2: Convert to fraction form
   139.54/209.31 = 48.25/x
3. Step 3: Cross multiply
   139.54x = 209.31 × 48.25
4. Step 4: Simplify right side
   139.54x = 10,099.21
5. Step 5: Solve for x
   x = 10,099.21/139.54
6. Step 6: Final answer
   x = 72.38