Finding the Fourth Proportional to 1,439.51, 1,986.50 and 810.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.51 : 1,986.50 = 810.03 : x
2. Step 2: Convert to fraction form
   1,439.51/1,986.50 = 810.03/x
3. Step 3: Cross multiply
   1,439.51x = 1,986.50 × 810.03
4. Step 4: Simplify right side
   1,439.51x = 1,609,134.07
5. Step 5: Solve for x
   x = 1,609,134.07/1,439.51
6. Step 6: Final answer
   x = 1,117.84