Finding the Fourth Proportional to 13,159.88, 19,570.57 and 12,744.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,159.88 : 19,570.57 = 12,744.59 : x
2. Step 2: Convert to fraction form
   13,159.88/19,570.57 = 12,744.59/x
3. Step 3: Cross multiply
   13,159.88x = 19,570.57 × 12,744.59
4. Step 4: Simplify right side
   13,159.88x = 249,418,890.72
5. Step 5: Solve for x
   x = 249,418,890.72/13,159.88
6. Step 6: Final answer
   x = 18,952.98