Finding the Fourth Proportional to 21,561.09, 32,329.33 and 8,406.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,561.09 : 32,329.33 = 8,406.28 : x
2. Step 2: Convert to fraction form
   21,561.09/32,329.33 = 8,406.28/x
3. Step 3: Cross multiply
   21,561.09x = 32,329.33 × 8,406.28
4. Step 4: Simplify right side
   21,561.09x = 271,769,419.59
5. Step 5: Solve for x
   x = 271,769,419.59/21,561.09
6. Step 6: Final answer
   x = 12,604.63