Finding the Fourth Proportional to 139.34, 209.15 and 67.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139.34 : 209.15 = 67.25 : x
2. Step 2: Convert to fraction form
   139.34/209.15 = 67.25/x
3. Step 3: Cross multiply
   139.34x = 209.15 × 67.25
4. Step 4: Simplify right side
   139.34x = 14,065.78
5. Step 5: Solve for x
   x = 14,065.78/139.34
6. Step 6: Final answer
   x = 100.94