Finding the Third Proportional to 189,308 and 401,992

Step by Step Solution

1. Step 1: Write the proportion equation
   189,308 : 401,992 = 401,992 : x
2. Step 2: Convert to fraction form
   189,308/401,992 = 401,992/x
3. Step 3: Cross multiply
   189,308x = 401,992 × 401,992
4. Step 4: Simplify right side
   189,308x = 161,597,568,064
5. Step 5: Solve for x
   x = 161,597,568,064/189,308
6. Step 6: Final answer
   x = 853,622.50