Finding the Fourth Proportional to 21,758.47, 30,026.43 and 12,198.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.47 : 30,026.43 = 12,198.31 : x
2. Step 2: Convert to fraction form
   21,758.47/30,026.43 = 12,198.31/x
3. Step 3: Cross multiply
   21,758.47x = 30,026.43 × 12,198.31
4. Step 4: Simplify right side
   21,758.47x = 366,271,626.27
5. Step 5: Solve for x
   x = 366,271,626.27/21,758.47
6. Step 6: Final answer
   x = 16,833.52