Finding the Fourth Proportional to 3,605.31, 5,399.87 and 2,145.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,605.31 : 5,399.87 = 2,145.69 : x
2. Step 2: Convert to fraction form
   3,605.31/5,399.87 = 2,145.69/x
3. Step 3: Cross multiply
   3,605.31x = 5,399.87 × 2,145.69
4. Step 4: Simplify right side
   3,605.31x = 11,586,436.33
5. Step 5: Solve for x
   x = 11,586,436.33/3,605.31
6. Step 6: Final answer
   x = 3,213.71