Finding the Fourth Proportional to 1,083.59, 1,626.17 and 806.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.59 : 1,626.17 = 806.57 : x
2. Step 2: Convert to fraction form
   1,083.59/1,626.17 = 806.57/x
3. Step 3: Cross multiply
   1,083.59x = 1,626.17 × 806.57
4. Step 4: Simplify right side
   1,083.59x = 1,311,613.82
5. Step 5: Solve for x
   x = 1,311,613.82/1,083.59
6. Step 6: Final answer
   x = 1,210.44