Finding the Fourth Proportional to 1,439.50, 1,986.48 and 810.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.50 : 1,986.48 = 810.02 : x
2. Step 2: Convert to fraction form
   1,439.50/1,986.48 = 810.02/x
3. Step 3: Cross multiply
   1,439.50x = 1,986.48 × 810.02
4. Step 4: Simplify right side
   1,439.50x = 1,609,099.25
5. Step 5: Solve for x
   x = 1,609,099.25/1,439.50
6. Step 6: Final answer
   x = 1,117.82