Finding the Fourth Proportional to 12,189, 18,322.68 and 11,322.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,189 : 18,322.68 = 11,322.40 : x
2. Step 2: Convert to fraction form
   12,189/18,322.68 = 11,322.40/x
3. Step 3: Cross multiply
   12,189x = 18,322.68 × 11,322.40
4. Step 4: Simplify right side
   12,189x = 207,456,712.03
5. Step 5: Solve for x
   x = 207,456,712.03/12,189
6. Step 6: Final answer
   x = 17,019.99