Finding the Fourth Proportional to 21,757.72, 30,025.68 and 11,821.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.72 : 30,025.68 = 11,821.72 : x
2. Step 2: Convert to fraction form
   21,757.72/30,025.68 = 11,821.72/x
3. Step 3: Cross multiply
   21,757.72x = 30,025.68 × 11,821.72
4. Step 4: Simplify right side
   21,757.72x = 354,955,181.77
5. Step 5: Solve for x
   x = 354,955,181.77/21,757.72
6. Step 6: Final answer
   x = 16,313.99