Finding the Fourth Proportional to 20,676.72, 30,990.42 and 14,402.76

Step by Step Solution

1. Step 1: Write the proportion equation
   20,676.72 : 30,990.42 = 14,402.76 : x
2. Step 2: Convert to fraction form
   20,676.72/30,990.42 = 14,402.76/x
3. Step 3: Cross multiply
   20,676.72x = 30,990.42 × 14,402.76
4. Step 4: Simplify right side
   20,676.72x = 446,347,581.56
5. Step 5: Solve for x
   x = 446,347,581.56/20,676.72
6. Step 6: Final answer
   x = 21,586.96