Finding the Third Proportional to 569,430 and 857,870

Step by Step Solution

1. Step 1: Write the proportion equation
   569,430 : 857,870 = 857,870 : x
2. Step 2: Convert to fraction form
   569,430/857,870 = 857,870/x
3. Step 3: Cross multiply
   569,430x = 857,870 × 857,870
4. Step 4: Simplify right side
   569,430x = 735,940,936,900
5. Step 5: Solve for x
   x = 735,940,936,900/569,430
6. Step 6: Final answer
   x = 1,292,416.87