Finding the Fourth Proportional to 10,821, 16,221.78 and 3,893.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,821 : 16,221.78 = 3,893.88 : x
2. Step 2: Convert to fraction form
   10,821/16,221.78 = 3,893.88/x
3. Step 3: Cross multiply
   10,821x = 16,221.78 × 3,893.88
4. Step 4: Simplify right side
   10,821x = 63,165,664.71
5. Step 5: Solve for x
   x = 63,165,664.71/10,821
6. Step 6: Final answer
   x = 5,837.32