Finding the Third Proportional to 190,665 and 407,499

Step by Step Solution

1. Step 1: Write the proportion equation
   190,665 : 407,499 = 407,499 : x
2. Step 2: Convert to fraction form
   190,665/407,499 = 407,499/x
3. Step 3: Cross multiply
   190,665x = 407,499 × 407,499
4. Step 4: Simplify right side
   190,665x = 166,055,435,001
5. Step 5: Solve for x
   x = 166,055,435,001/190,665
6. Step 6: Final answer
   x = 870,927.73