Finding the Third Proportional to 200,850 and 428,388

Step by Step Solution

1. Step 1: Write the proportion equation
   200,850 : 428,388 = 428,388 : x
2. Step 2: Convert to fraction form
   200,850/428,388 = 428,388/x
3. Step 3: Cross multiply
   200,850x = 428,388 × 428,388
4. Step 4: Simplify right side
   200,850x = 183,516,278,544
5. Step 5: Solve for x
   x = 183,516,278,544/200,850
6. Step 6: Final answer
   x = 913,698.18