Finding the Fourth Proportional to 1,605.59, 2,408.72 and 681.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.59 : 2,408.72 = 681.15 : x
2. Step 2: Convert to fraction form
   1,605.59/2,408.72 = 681.15/x
3. Step 3: Cross multiply
   1,605.59x = 2,408.72 × 681.15
4. Step 4: Simplify right side
   1,605.59x = 1,640,699.63
5. Step 5: Solve for x
   x = 1,640,699.63/1,605.59
6. Step 6: Final answer
   x = 1,021.87