Finding the Third Proportional to 400,512 and 812,076

Step by Step Solution

1. Step 1: Write the proportion equation
   400,512 : 812,076 = 812,076 : x
2. Step 2: Convert to fraction form
   400,512/812,076 = 812,076/x
3. Step 3: Cross multiply
   400,512x = 812,076 × 812,076
4. Step 4: Simplify right side
   400,512x = 659,467,429,776
5. Step 5: Solve for x
   x = 659,467,429,776/400,512
6. Step 6: Final answer
   x = 1,646,560.98