Finding the Third Proportional to 415,956 and 669,870

Step by Step Solution

1. Step 1: Write the proportion equation
   415,956 : 669,870 = 669,870 : x
2. Step 2: Convert to fraction form
   415,956/669,870 = 669,870/x
3. Step 3: Cross multiply
   415,956x = 669,870 × 669,870
4. Step 4: Simplify right side
   415,956x = 448,725,816,900
5. Step 5: Solve for x
   x = 448,725,816,900/415,956
6. Step 6: Final answer
   x = 1,078,781.93