Finding the Third Proportional to 279,436 and 428,162

Step by Step Solution

1. Step 1: Write the proportion equation
   279,436 : 428,162 = 428,162 : x
2. Step 2: Convert to fraction form
   279,436/428,162 = 428,162/x
3. Step 3: Cross multiply
   279,436x = 428,162 × 428,162
4. Step 4: Simplify right side
   279,436x = 183,322,698,244
5. Step 5: Solve for x
   x = 183,322,698,244/279,436
6. Step 6: Final answer
   x = 656,045.39