Finding the Fourth Proportional to 1,435.49, 1,980.81 and 805.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.49 : 1,980.81 = 805.89 : x
2. Step 2: Convert to fraction form
   1,435.49/1,980.81 = 805.89/x
3. Step 3: Cross multiply
   1,435.49x = 1,980.81 × 805.89
4. Step 4: Simplify right side
   1,435.49x = 1,596,314.97
5. Step 5: Solve for x
   x = 1,596,314.97/1,435.49
6. Step 6: Final answer
   x = 1,112.03