Finding the Fourth Proportional to 21,826.40, 30,120.47 and 12,394.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.40 : 30,120.47 = 12,394.96 : x
2. Step 2: Convert to fraction form
   21,826.40/30,120.47 = 12,394.96/x
3. Step 3: Cross multiply
   21,826.40x = 30,120.47 × 12,394.96
4. Step 4: Simplify right side
   21,826.40x = 373,342,020.83
5. Step 5: Solve for x
   x = 373,342,020.83/21,826.40
6. Step 6: Final answer
   x = 17,105.07