Finding the Third Proportional to 400,572 and 812,196

Step by Step Solution

1. Step 1: Write the proportion equation
   400,572 : 812,196 = 812,196 : x
2. Step 2: Convert to fraction form
   400,572/812,196 = 812,196/x
3. Step 3: Cross multiply
   400,572x = 812,196 × 812,196
4. Step 4: Simplify right side
   400,572x = 659,662,342,416
5. Step 5: Solve for x
   x = 659,662,342,416/400,572
6. Step 6: Final answer
   x = 1,646,800.93