Finding the Fourth Proportional to 1,605.33, 2,406.17 and 680.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.33 : 2,406.17 = 680.31 : x
2. Step 2: Convert to fraction form
   1,605.33/2,406.17 = 680.31/x
3. Step 3: Cross multiply
   1,605.33x = 2,406.17 × 680.31
4. Step 4: Simplify right side
   1,605.33x = 1,636,938.11
5. Step 5: Solve for x
   x = 1,636,938.11/1,605.33
6. Step 6: Final answer
   x = 1,019.69