Finding the Fourth Proportional to 1,439.76, 1,986.85 and 810.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.76 : 1,986.85 = 810.29 : x
2. Step 2: Convert to fraction form
   1,439.76/1,986.85 = 810.29/x
3. Step 3: Cross multiply
   1,439.76x = 1,986.85 × 810.29
4. Step 4: Simplify right side
   1,439.76x = 1,609,924.69
5. Step 5: Solve for x
   x = 1,609,924.69/1,439.76
6. Step 6: Final answer
   x = 1,118.19