Finding the Fourth Proportional to 21,982.68, 30,341.61 and 12,556.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,982.68 : 30,341.61 = 12,556.71 : x
2. Step 2: Convert to fraction form
   21,982.68/30,341.61 = 12,556.71/x
3. Step 3: Cross multiply
   21,982.68x = 30,341.61 × 12,556.71
4. Step 4: Simplify right side
   21,982.68x = 380,990,797.70
5. Step 5: Solve for x
   x = 380,990,797.70/21,982.68
6. Step 6: Final answer
   x = 17,331.41