Finding the Third Proportional to 209,562 and 428,808

Step by Step Solution

1. Step 1: Write the proportion equation
   209,562 : 428,808 = 428,808 : x
2. Step 2: Convert to fraction form
   209,562/428,808 = 428,808/x
3. Step 3: Cross multiply
   209,562x = 428,808 × 428,808
4. Step 4: Simplify right side
   209,562x = 183,876,300,864
5. Step 5: Solve for x
   x = 183,876,300,864/209,562
6. Step 6: Final answer
   x = 877,431.50