Finding the Fourth Proportional to 20,443, 30,485.59 and 20,256.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,443 : 30,485.59 = 20,256.16 : x
2. Step 2: Convert to fraction form
   20,443/30,485.59 = 20,256.16/x
3. Step 3: Cross multiply
   20,443x = 30,485.59 × 20,256.16
4. Step 4: Simplify right side
   20,443x = 617,520,988.73
5. Step 5: Solve for x
   x = 617,520,988.73/20,443
6. Step 6: Final answer
   x = 30,206.97