Finding the Fourth Proportional to 139.72, 209.56 and 94.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 209.56 = 94.09 : x
2. Step 2: Convert to fraction form
   139.72/209.56 = 94.09/x
3. Step 3: Cross multiply
   139.72x = 209.56 × 94.09
4. Step 4: Simplify right side
   139.72x = 19,717.50
5. Step 5: Solve for x
   x = 19,717.50/139.72
6. Step 6: Final answer
   x = 141.12