Finding the Fourth Proportional to 12,981, 19,485.36 and 5,589.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981 : 19,485.36 = 5,589.12 : x
2. Step 2: Convert to fraction form
   12,981/19,485.36 = 5,589.12/x
3. Step 3: Cross multiply
   12,981x = 19,485.36 × 5,589.12
4. Step 4: Simplify right side
   12,981x = 108,906,015.28
5. Step 5: Solve for x
   x = 108,906,015.28/12,981
6. Step 6: Final answer
   x = 8,389.65