Finding the Fourth Proportional to 20,404.49, 30,603.21 and 5,411.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,404.49 : 30,603.21 = 5,411.72 : x
2. Step 2: Convert to fraction form
   20,404.49/30,603.21 = 5,411.72/x
3. Step 3: Cross multiply
   20,404.49x = 30,603.21 × 5,411.72
4. Step 4: Simplify right side
   20,404.49x = 165,615,850.61
5. Step 5: Solve for x
   x = 165,615,850.61/20,404.49
6. Step 6: Final answer
   x = 8,116.64