Finding the Fourth Proportional to 21,819.90, 30,107.82 and 12,866.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.90 : 30,107.82 = 12,866.16 : x
2. Step 2: Convert to fraction form
   21,819.90/30,107.82 = 12,866.16/x
3. Step 3: Cross multiply
   21,819.90x = 30,107.82 × 12,866.16
4. Step 4: Simplify right side
   21,819.90x = 387,372,029.37
5. Step 5: Solve for x
   x = 387,372,029.37/21,819.90
6. Step 6: Final answer
   x = 17,753.15