Finding the Third Proportional to 300,814 and 668,870

Step by Step Solution

1. Step 1: Write the proportion equation
   300,814 : 668,870 = 668,870 : x
2. Step 2: Convert to fraction form
   300,814/668,870 = 668,870/x
3. Step 3: Cross multiply
   300,814x = 668,870 × 668,870
4. Step 4: Simplify right side
   300,814x = 447,387,076,900
5. Step 5: Solve for x
   x = 447,387,076,900/300,814
6. Step 6: Final answer
   x = 1,487,254.84