Finding the Fourth Proportional to 6,443.74, 9,665.15 and 2,001.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,443.74 : 9,665.15 = 2,001.28 : x
2. Step 2: Convert to fraction form
   6,443.74/9,665.15 = 2,001.28/x
3. Step 3: Cross multiply
   6,443.74x = 9,665.15 × 2,001.28
4. Step 4: Simplify right side
   6,443.74x = 19,342,671.39
5. Step 5: Solve for x
   x = 19,342,671.39/6,443.74
6. Step 6: Final answer
   x = 3,001.78