Finding the Third Proportional to 685,870 and 1,018,870

Step by Step Solution

1. Step 1: Write the proportion equation
   685,870 : 1,018,870 = 1,018,870 : x
2. Step 2: Convert to fraction form
   685,870/1,018,870 = 1,018,870/x
3. Step 3: Cross multiply
   685,870x = 1,018,870 × 1,018,870
4. Step 4: Simplify right side
   685,870x = 1,038,096,076,900
5. Step 5: Solve for x
   x = 1,038,096,076,900/685,870
6. Step 6: Final answer
   x = 1,513,546.41