Finding the Fourth Proportional to 20,865, 28,793.73 and 12,481.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,865 : 28,793.73 = 12,481.50 : x
2. Step 2: Convert to fraction form
   20,865/28,793.73 = 12,481.50/x
3. Step 3: Cross multiply
   20,865x = 28,793.73 × 12,481.50
4. Step 4: Simplify right side
   20,865x = 359,388,941.00
5. Step 5: Solve for x
   x = 359,388,941.00/20,865
6. Step 6: Final answer
   x = 17,224.49