Finding the Fourth Proportional to 21,949.85, 30,290.83 and 11,878.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,949.85 : 30,290.83 = 11,878.31 : x
2. Step 2: Convert to fraction form
   21,949.85/30,290.83 = 11,878.31/x
3. Step 3: Cross multiply
   21,949.85x = 30,290.83 × 11,878.31
4. Step 4: Simplify right side
   21,949.85x = 359,803,914.93
5. Step 5: Solve for x
   x = 359,803,914.93/21,949.85
6. Step 6: Final answer
   x = 16,392.09