Finding the Fourth Proportional to 20,856, 28,781.28 and 12,024

Step by Step Solution

1. Step 1: Write the proportion equation
   20,856 : 28,781.28 = 12,024 : x
2. Step 2: Convert to fraction form
   20,856/28,781.28 = 12,024/x
3. Step 3: Cross multiply
   20,856x = 28,781.28 × 12,024
4. Step 4: Simplify right side
   20,856x = 346,066,110.72
5. Step 5: Solve for x
   x = 346,066,110.72/20,856
6. Step 6: Final answer
   x = 16,593.12