Finding the Fourth Proportional to 20,564.48, 28,380.89 and 12,496.27

Step by Step Solution

1. Step 1: Write the proportion equation
   20,564.48 : 28,380.89 = 12,496.27 : x
2. Step 2: Convert to fraction form
   20,564.48/28,380.89 = 12,496.27/x
3. Step 3: Cross multiply
   20,564.48x = 28,380.89 × 12,496.27
4. Step 4: Simplify right side
   20,564.48x = 354,655,289.50
5. Step 5: Solve for x
   x = 354,655,289.50/20,564.48
6. Step 6: Final answer
   x = 17,246.02