Finding the Third Proportional to 810.56 and 1,285.69

Step by Step Solution

1. Step 1: Write the proportion equation
   810.56 : 1,285.69 = 1,285.69 : x
2. Step 2: Convert to fraction form
   810.56/1,285.69 = 1,285.69/x
3. Step 3: Cross multiply
   810.56x = 1,285.69 × 1,285.69
4. Step 4: Simplify right side
   810.56x = 1,652,992.35
5. Step 5: Solve for x
   x = 1,652,992.35/810.56
6. Step 6: Final answer
   x = 2,039.32