Finding the Third Proportional to 186,638 and 404,380

Step by Step Solution

1. Step 1: Write the proportion equation
   186,638 : 404,380 = 404,380 : x
2. Step 2: Convert to fraction form
   186,638/404,380 = 404,380/x
3. Step 3: Cross multiply
   186,638x = 404,380 × 404,380
4. Step 4: Simplify right side
   186,638x = 163,523,184,400
5. Step 5: Solve for x
   x = 163,523,184,400/186,638
6. Step 6: Final answer
   x = 876,151.61