Finding the Third Proportional to 643,718 and 945,870

Step by Step Solution

1. Step 1: Write the proportion equation
   643,718 : 945,870 = 945,870 : x
2. Step 2: Convert to fraction form
   643,718/945,870 = 945,870/x
3. Step 3: Cross multiply
   643,718x = 945,870 × 945,870
4. Step 4: Simplify right side
   643,718x = 894,670,056,900
5. Step 5: Solve for x
   x = 894,670,056,900/643,718
6. Step 6: Final answer
   x = 1,389,847.82