Finding the Fourth Proportional to 12,309.69, 18,368.47 and 10,984.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.69 : 18,368.47 = 10,984.33 : x
2. Step 2: Convert to fraction form
   12,309.69/18,368.47 = 10,984.33/x
3. Step 3: Cross multiply
   12,309.69x = 18,368.47 × 10,984.33
4. Step 4: Simplify right side
   12,309.69x = 201,765,189.31
5. Step 5: Solve for x
   x = 201,765,189.31/12,309.69
6. Step 6: Final answer
   x = 16,390.76