Finding the Third Proportional to 286,810 and 443,871

Step by Step Solution

1. Step 1: Write the proportion equation
   286,810 : 443,871 = 443,871 : x
2. Step 2: Convert to fraction form
   286,810/443,871 = 443,871/x
3. Step 3: Cross multiply
   286,810x = 443,871 × 443,871
4. Step 4: Simplify right side
   286,810x = 197,021,464,641
5. Step 5: Solve for x
   x = 197,021,464,641/286,810
6. Step 6: Final answer
   x = 686,940.71