Finding the Fourth Proportional to 19,297.88, 28,913.72 and 12,960.88

Step by Step Solution

1. Step 1: Write the proportion equation
   19,297.88 : 28,913.72 = 12,960.88 : x
2. Step 2: Convert to fraction form
   19,297.88/28,913.72 = 12,960.88/x
3. Step 3: Cross multiply
   19,297.88x = 28,913.72 × 12,960.88
4. Step 4: Simplify right side
   19,297.88x = 374,747,255.27
5. Step 5: Solve for x
   x = 374,747,255.27/19,297.88
6. Step 6: Final answer
   x = 19,419.09