Finding the Fourth Proportional to 10,729.28, 14,810.40 and 7,421.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,729.28 : 14,810.40 = 7,421.76 : x
2. Step 2: Convert to fraction form
   10,729.28/14,810.40 = 7,421.76/x
3. Step 3: Cross multiply
   10,729.28x = 14,810.40 × 7,421.76
4. Step 4: Simplify right side
   10,729.28x = 109,919,234.30
5. Step 5: Solve for x
   x = 109,919,234.30/10,729.28
6. Step 6: Final answer
   x = 10,244.79