Finding the Fourth Proportional to 20,694.82, 31,049.79 and 12,910.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,694.82 : 31,049.79 = 12,910.18 : x
2. Step 2: Convert to fraction form
   20,694.82/31,049.79 = 12,910.18/x
3. Step 3: Cross multiply
   20,694.82x = 31,049.79 × 12,910.18
4. Step 4: Simplify right side
   20,694.82x = 400,858,377.86
5. Step 5: Solve for x
   x = 400,858,377.86/20,694.82
6. Step 6: Final answer
   x = 19,369.99