Finding the Fourth Proportional to 12,309.21, 16,986.87 and 7,004.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.21 : 16,986.87 = 7,004.16 : x
2. Step 2: Convert to fraction form
   12,309.21/16,986.87 = 7,004.16/x
3. Step 3: Cross multiply
   12,309.21x = 16,986.87 × 7,004.16
4. Step 4: Simplify right side
   12,309.21x = 118,978,755.38
5. Step 5: Solve for x
   x = 118,978,755.38/12,309.21
6. Step 6: Final answer
   x = 9,665.83