Finding the Fourth Proportional to 20,291.72, 30,443.18 and 8,451.06

Step by Step Solution

1. Step 1: Write the proportion equation
   20,291.72 : 30,443.18 = 8,451.06 : x
2. Step 2: Convert to fraction form
   20,291.72/30,443.18 = 8,451.06/x
3. Step 3: Cross multiply
   20,291.72x = 30,443.18 × 8,451.06
4. Step 4: Simplify right side
   20,291.72x = 257,277,098.52
5. Step 5: Solve for x
   x = 257,277,098.52/20,291.72
6. Step 6: Final answer
   x = 12,678.92