Finding the Fourth Proportional to 1,439.75, 1,986.71 and 810.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.75 : 1,986.71 = 810.23 : x
2. Step 2: Convert to fraction form
   1,439.75/1,986.71 = 810.23/x
3. Step 3: Cross multiply
   1,439.75x = 1,986.71 × 810.23
4. Step 4: Simplify right side
   1,439.75x = 1,609,678.06
5. Step 5: Solve for x
   x = 1,609,678.06/1,439.75
6. Step 6: Final answer
   x = 1,118.03