Finding the Third Proportional to 186,643 and 404,390

Step by Step Solution

1. Step 1: Write the proportion equation
   186,643 : 404,390 = 404,390 : x
2. Step 2: Convert to fraction form
   186,643/404,390 = 404,390/x
3. Step 3: Cross multiply
   186,643x = 404,390 × 404,390
4. Step 4: Simplify right side
   186,643x = 163,531,272,100
5. Step 5: Solve for x
   x = 163,531,272,100/186,643
6. Step 6: Final answer
   x = 876,171.47