Finding the Fourth Proportional to 16,789.88, 25,136.18 and 12,647.33

Step by Step Solution

1. Step 1: Write the proportion equation
   16,789.88 : 25,136.18 = 12,647.33 : x
2. Step 2: Convert to fraction form
   16,789.88/25,136.18 = 12,647.33/x
3. Step 3: Cross multiply
   16,789.88x = 25,136.18 × 12,647.33
4. Step 4: Simplify right side
   16,789.88x = 317,905,500.16
5. Step 5: Solve for x
   x = 317,905,500.16/16,789.88
6. Step 6: Final answer
   x = 18,934.36