Finding the Fourth Proportional to 21,698.69, 29,931.73 and 12,744.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,698.69 : 29,931.73 = 12,744.54 : x
2. Step 2: Convert to fraction form
   21,698.69/29,931.73 = 12,744.54/x
3. Step 3: Cross multiply
   21,698.69x = 29,931.73 × 12,744.54
4. Step 4: Simplify right side
   21,698.69x = 381,466,098.39
5. Step 5: Solve for x
   x = 381,466,098.39/21,698.69
6. Step 6: Final answer
   x = 17,580.15