Finding the Fourth Proportional to 20,401.49, 30,598.71 and 5,408.71

Step by Step Solution

1. Step 1: Write the proportion equation
   20,401.49 : 30,598.71 = 5,408.71 : x
2. Step 2: Convert to fraction form
   20,401.49/30,598.71 = 5,408.71/x
3. Step 3: Cross multiply
   20,401.49x = 30,598.71 × 5,408.71
4. Step 4: Simplify right side
   20,401.49x = 165,499,472.27
5. Step 5: Solve for x
   x = 165,499,472.27/20,401.49
6. Step 6: Final answer
   x = 8,112.13