Finding the Third Proportional to 809,980 and 1,287,310

Step by Step Solution

1. Step 1: Write the proportion equation
   809,980 : 1,287,310 = 1,287,310 : x
2. Step 2: Convert to fraction form
   809,980/1,287,310 = 1,287,310/x
3. Step 3: Cross multiply
   809,980x = 1,287,310 × 1,287,310
4. Step 4: Simplify right side
   809,980x = 1,657,167,036,100
5. Step 5: Solve for x
   x = 1,657,167,036,100/809,980
6. Step 6: Final answer
   x = 2,045,935.75