Finding the Fourth Proportional to 10,806.78, 16,212 and 3,411.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,806.78 : 16,212 = 3,411.09 : x
2. Step 2: Convert to fraction form
   10,806.78/16,212 = 3,411.09/x
3. Step 3: Cross multiply
   10,806.78x = 16,212 × 3,411.09
4. Step 4: Simplify right side
   10,806.78x = 55,300,591.08
5. Step 5: Solve for x
   x = 55,300,591.08/10,806.78
6. Step 6: Final answer
   x = 5,117.21