Finding the Fourth Proportional to 139.50, 209.25 and 48.17

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 209.25 = 48.17 : x
2. Step 2: Convert to fraction form
   139.50/209.25 = 48.17/x
3. Step 3: Cross multiply
   139.50x = 209.25 × 48.17
4. Step 4: Simplify right side
   139.50x = 10,080.10
5. Step 5: Solve for x
   x = 10,080.10/139.50
6. Step 6: Final answer
   x = 72.26