Finding the Fourth Proportional to 20,291.96, 30,443.56 and 8,451.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,291.96 : 30,443.56 = 8,451.30 : x
2. Step 2: Convert to fraction form
   20,291.96/30,443.56 = 8,451.30/x
3. Step 3: Cross multiply
   20,291.96x = 30,443.56 × 8,451.30
4. Step 4: Simplify right side
   20,291.96x = 257,287,658.63
5. Step 5: Solve for x
   x = 257,287,658.63/20,291.96
6. Step 6: Final answer
   x = 12,679.29