Finding the Fourth Proportional to 21,788.99, 30,071.82 and 12,229.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,788.99 : 30,071.82 = 12,229.45 : x
2. Step 2: Convert to fraction form
   21,788.99/30,071.82 = 12,229.45/x
3. Step 3: Cross multiply
   21,788.99x = 30,071.82 × 12,229.45
4. Step 4: Simplify right side
   21,788.99x = 367,761,789.78
5. Step 5: Solve for x
   x = 367,761,789.78/21,788.99
6. Step 6: Final answer
   x = 16,878.33