Finding the Third Proportional to 399,602 and 836,144

Step by Step Solution

1. Step 1: Write the proportion equation
   399,602 : 836,144 = 836,144 : x
2. Step 2: Convert to fraction form
   399,602/836,144 = 836,144/x
3. Step 3: Cross multiply
   399,602x = 836,144 × 836,144
4. Step 4: Simplify right side
   399,602x = 699,136,788,736
5. Step 5: Solve for x
   x = 699,136,788,736/399,602
6. Step 6: Final answer
   x = 1,749,582.81