Finding the Fourth Proportional to 18,819.98, 25,971.71 and 12,851.49

Step by Step Solution

1. Step 1: Write the proportion equation
   18,819.98 : 25,971.71 = 12,851.49 : x
2. Step 2: Convert to fraction form
   18,819.98/25,971.71 = 12,851.49/x
3. Step 3: Cross multiply
   18,819.98x = 25,971.71 × 12,851.49
4. Step 4: Simplify right side
   18,819.98x = 333,775,171.35
5. Step 5: Solve for x
   x = 333,775,171.35/18,819.98
6. Step 6: Final answer
   x = 17,735.15