Finding the Fourth Proportional to 21,856.35, 30,161.63 and 12,424.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,856.35 : 30,161.63 = 12,424.92 : x
2. Step 2: Convert to fraction form
   21,856.35/30,161.63 = 12,424.92/x
3. Step 3: Cross multiply
   21,856.35x = 30,161.63 × 12,424.92
4. Step 4: Simplify right side
   21,856.35x = 374,755,839.82
5. Step 5: Solve for x
   x = 374,755,839.82/21,856.35
6. Step 6: Final answer
   x = 17,146.31