Finding the Third Proportional to 196,445 and 428,870

Step by Step Solution

1. Step 1: Write the proportion equation
   196,445 : 428,870 = 428,870 : x
2. Step 2: Convert to fraction form
   196,445/428,870 = 428,870/x
3. Step 3: Cross multiply
   196,445x = 428,870 × 428,870
4. Step 4: Simplify right side
   196,445x = 183,929,476,900
5. Step 5: Solve for x
   x = 183,929,476,900/196,445
6. Step 6: Final answer
   x = 936,289.94