Finding the Fourth Proportional to 12,216.02, 18,329.49 and 7,021.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216.02 : 18,329.49 = 7,021.89 : x
2. Step 2: Convert to fraction form
   12,216.02/18,329.49 = 7,021.89/x
3. Step 3: Cross multiply
   12,216.02x = 18,329.49 × 7,021.89
4. Step 4: Simplify right side
   12,216.02x = 128,707,662.54
5. Step 5: Solve for x
   x = 128,707,662.54/12,216.02
6. Step 6: Final answer
   x = 10,535.98