Finding the Fourth Proportional to 21,809.40, 30,093.33 and 12,855.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,809.40 : 30,093.33 = 12,855.69 : x
2. Step 2: Convert to fraction form
   21,809.40/30,093.33 = 12,855.69/x
3. Step 3: Cross multiply
   21,809.40x = 30,093.33 × 12,855.69
4. Step 4: Simplify right side
   21,809.40x = 386,870,521.55
5. Step 5: Solve for x
   x = 386,870,521.55/21,809.40
6. Step 6: Final answer
   x = 17,738.71