Finding the Fourth Proportional to 7,049.42, 9,728.37 and 3,905.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,049.42 : 9,728.37 = 3,905.78 : x
2. Step 2: Convert to fraction form
   7,049.42/9,728.37 = 3,905.78/x
3. Step 3: Cross multiply
   7,049.42x = 9,728.37 × 3,905.78
4. Step 4: Simplify right side
   7,049.42x = 37,996,872.98
5. Step 5: Solve for x
   x = 37,996,872.98/7,049.42
6. Step 6: Final answer
   x = 5,390.07