Finding the Fourth Proportional to 20,857.50, 28,783.35 and 12,474

Step by Step Solution

1. Step 1: Write the proportion equation
   20,857.50 : 28,783.35 = 12,474 : x
2. Step 2: Convert to fraction form
   20,857.50/28,783.35 = 12,474/x
3. Step 3: Cross multiply
   20,857.50x = 28,783.35 × 12,474
4. Step 4: Simplify right side
   20,857.50x = 359,043,507.90
5. Step 5: Solve for x
   x = 359,043,507.90/20,857.50
6. Step 6: Final answer
   x = 17,214.12