Finding the Fourth Proportional to 20,783.36, 28,671.90 and 12,395

Step by Step Solution

1. Step 1: Write the proportion equation
   20,783.36 : 28,671.90 = 12,395 : x
2. Step 2: Convert to fraction form
   20,783.36/28,671.90 = 12,395/x
3. Step 3: Cross multiply
   20,783.36x = 28,671.90 × 12,395
4. Step 4: Simplify right side
   20,783.36x = 355,388,200.50
5. Step 5: Solve for x
   x = 355,388,200.50/20,783.36
6. Step 6: Final answer
   x = 17,099.65