Finding the Fourth Proportional to 139.50, 209.28 and 48.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 209.28 = 48.27 : x
2. Step 2: Convert to fraction form
   139.50/209.28 = 48.27/x
3. Step 3: Cross multiply
   139.50x = 209.28 × 48.27
4. Step 4: Simplify right side
   139.50x = 10,102.32
5. Step 5: Solve for x
   x = 10,102.32/139.50
6. Step 6: Final answer
   x = 72.42