Finding the Fourth Proportional to 13,456.88, 20,306.72 and 12,968.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.88 : 20,306.72 = 12,968.72 : x
2. Step 2: Convert to fraction form
   13,456.88/20,306.72 = 12,968.72/x
3. Step 3: Cross multiply
   13,456.88x = 20,306.72 × 12,968.72
4. Step 4: Simplify right side
   13,456.88x = 263,352,165.80
5. Step 5: Solve for x
   x = 263,352,165.80/13,456.88
6. Step 6: Final answer
   x = 19,570.08