Finding the Fourth Proportional to 139.56, 209.35 and 48.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139.56 : 209.35 = 48.27 : x
2. Step 2: Convert to fraction form
   139.56/209.35 = 48.27/x
3. Step 3: Cross multiply
   139.56x = 209.35 × 48.27
4. Step 4: Simplify right side
   139.56x = 10,105.32
5. Step 5: Solve for x
   x = 10,105.32/139.56
6. Step 6: Final answer
   x = 72.41