Finding the Fourth Proportional to 11,456.40, 17,187.30 and 3,665.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,456.40 : 17,187.30 = 3,665.28 : x
2. Step 2: Convert to fraction form
   11,456.40/17,187.30 = 3,665.28/x
3. Step 3: Cross multiply
   11,456.40x = 17,187.30 × 3,665.28
4. Step 4: Simplify right side
   11,456.40x = 62,996,266.94
5. Step 5: Solve for x
   x = 62,996,266.94/11,456.40
6. Step 6: Final answer
   x = 5,498.78