Finding the Fourth Proportional to 1,605.82, 2,217.09 and 1,039.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.82 : 2,217.09 = 1,039.72 : x
2. Step 2: Convert to fraction form
   1,605.82/2,217.09 = 1,039.72/x
3. Step 3: Cross multiply
   1,605.82x = 2,217.09 × 1,039.72
4. Step 4: Simplify right side
   1,605.82x = 2,305,152.81
5. Step 5: Solve for x
   x = 2,305,152.81/1,605.82
6. Step 6: Final answer
   x = 1,435.50