Finding the Third Proportional to 400,530 and 812,112

Step by Step Solution

1. Step 1: Write the proportion equation
   400,530 : 812,112 = 812,112 : x
2. Step 2: Convert to fraction form
   400,530/812,112 = 812,112/x
3. Step 3: Cross multiply
   400,530x = 812,112 × 812,112
4. Step 4: Simplify right side
   400,530x = 659,525,900,544
5. Step 5: Solve for x
   x = 659,525,900,544/400,530
6. Step 6: Final answer
   x = 1,646,632.96