Finding the Third Proportional to 400,540 and 812,132

Step by Step Solution

1. Step 1: Write the proportion equation
   400,540 : 812,132 = 812,132 : x
2. Step 2: Convert to fraction form
   400,540/812,132 = 812,132/x
3. Step 3: Cross multiply
   400,540x = 812,132 × 812,132
4. Step 4: Simplify right side
   400,540x = 659,558,385,424
5. Step 5: Solve for x
   x = 659,558,385,424/400,540
6. Step 6: Final answer
   x = 1,646,672.96