Finding the Third Proportional to 191,066 and 404,890

Step by Step Solution

1. Step 1: Write the proportion equation
   191,066 : 404,890 = 404,890 : x
2. Step 2: Convert to fraction form
   191,066/404,890 = 404,890/x
3. Step 3: Cross multiply
   191,066x = 404,890 × 404,890
4. Step 4: Simplify right side
   191,066x = 163,935,912,100
5. Step 5: Solve for x
   x = 163,935,912,100/191,066
6. Step 6: Final answer
   x = 858,006.72