Finding the Fourth Proportional to 20,496.78, 28,280.34 and 12,536.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,496.78 : 28,280.34 = 12,536.10 : x
2. Step 2: Convert to fraction form
   20,496.78/28,280.34 = 12,536.10/x
3. Step 3: Cross multiply
   20,496.78x = 28,280.34 × 12,536.10
4. Step 4: Simplify right side
   20,496.78x = 354,525,170.27
5. Step 5: Solve for x
   x = 354,525,170.27/20,496.78
6. Step 6: Final answer
   x = 17,296.63