Finding the Fourth Proportional to 22,956.36, 31,679.46 and 12,885

Step by Step Solution

1. Step 1: Write the proportion equation
   22,956.36 : 31,679.46 = 12,885 : x
2. Step 2: Convert to fraction form
   22,956.36/31,679.46 = 12,885/x
3. Step 3: Cross multiply
   22,956.36x = 31,679.46 × 12,885
4. Step 4: Simplify right side
   22,956.36x = 408,189,842.10
5. Step 5: Solve for x
   x = 408,189,842.10/22,956.36
6. Step 6: Final answer
   x = 17,781.12