Finding the Fourth Proportional to 20,748.96, 31,142.88 and 9,663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,748.96 : 31,142.88 = 9,663.30 : x
2. Step 2: Convert to fraction form
   20,748.96/31,142.88 = 9,663.30/x
3. Step 3: Cross multiply
   20,748.96x = 31,142.88 × 9,663.30
4. Step 4: Simplify right side
   20,748.96x = 300,942,992.30
5. Step 5: Solve for x
   x = 300,942,992.30/20,748.96
6. Step 6: Final answer
   x = 14,504.00