Finding the Fourth Proportional to 21,843, 30,146.85 and 12,417.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,843 : 30,146.85 = 12,417.30 : x
2. Step 2: Convert to fraction form
   21,843/30,146.85 = 12,417.30/x
3. Step 3: Cross multiply
   21,843x = 30,146.85 × 12,417.30
4. Step 4: Simplify right side
   21,843x = 374,342,480.51
5. Step 5: Solve for x
   x = 374,342,480.51/21,843
6. Step 6: Final answer
   x = 17,137.87