Finding the Fourth Proportional to 8,993.30, 12,431.49 and 8,993.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,993.30 : 12,431.49 = 8,993.30 : x
2. Step 2: Convert to fraction form
   8,993.30/12,431.49 = 8,993.30/x
3. Step 3: Cross multiply
   8,993.30x = 12,431.49 × 8,993.30
4. Step 4: Simplify right side
   8,993.30x = 111,800,119.02
5. Step 5: Solve for x
   x = 111,800,119.02/8,993.30
6. Step 6: Final answer
   x = 12,431.49