Finding the Third Proportional to 191,922 and 405,990

Step by Step Solution

1. Step 1: Write the proportion equation
   191,922 : 405,990 = 405,990 : x
2. Step 2: Convert to fraction form
   191,922/405,990 = 405,990/x
3. Step 3: Cross multiply
   191,922x = 405,990 × 405,990
4. Step 4: Simplify right side
   191,922x = 164,827,880,100
5. Step 5: Solve for x
   x = 164,827,880,100/191,922
6. Step 6: Final answer
   x = 858,827.44