Finding the Third Proportional to 401,578 and 836,426

Step by Step Solution

1. Step 1: Write the proportion equation
   401,578 : 836,426 = 836,426 : x
2. Step 2: Convert to fraction form
   401,578/836,426 = 836,426/x
3. Step 3: Cross multiply
   401,578x = 836,426 × 836,426
4. Step 4: Simplify right side
   401,578x = 699,608,453,476
5. Step 5: Solve for x
   x = 699,608,453,476/401,578
6. Step 6: Final answer
   x = 1,742,148.36