Finding the Fourth Proportional to 13,072.76, 19,491.91 and 12,839.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.76 : 19,491.91 = 12,839.48 : x
2. Step 2: Convert to fraction form
   13,072.76/19,491.91 = 12,839.48/x
3. Step 3: Cross multiply
   13,072.76x = 19,491.91 × 12,839.48
4. Step 4: Simplify right side
   13,072.76x = 250,265,988.61
5. Step 5: Solve for x
   x = 250,265,988.61/13,072.76
6. Step 6: Final answer
   x = 19,144.08