Finding the Fourth Proportional to 1,439.43, 1,986.38 and 810.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.43 : 1,986.38 = 810.03 : x
2. Step 2: Convert to fraction form
   1,439.43/1,986.38 = 810.03/x
3. Step 3: Cross multiply
   1,439.43x = 1,986.38 × 810.03
4. Step 4: Simplify right side
   1,439.43x = 1,609,023.34
5. Step 5: Solve for x
   x = 1,609,023.34/1,439.43
6. Step 6: Final answer
   x = 1,117.82