Finding the Fourth Proportional to 8,821.37, 12,172.59 and 5,284.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,821.37 : 12,172.59 = 5,284.49 : x
2. Step 2: Convert to fraction form
   8,821.37/12,172.59 = 5,284.49/x
3. Step 3: Cross multiply
   8,821.37x = 12,172.59 × 5,284.49
4. Step 4: Simplify right side
   8,821.37x = 64,325,869.27
5. Step 5: Solve for x
   x = 64,325,869.27/8,821.37
6. Step 6: Final answer
   x = 7,292.05