Finding the Third Proportional to 812,210 and 1,786,420

Step by Step Solution

1. Step 1: Write the proportion equation
   812,210 : 1,786,420 = 1,786,420 : x
2. Step 2: Convert to fraction form
   812,210/1,786,420 = 1,786,420/x
3. Step 3: Cross multiply
   812,210x = 1,786,420 × 1,786,420
4. Step 4: Simplify right side
   812,210x = 3,191,296,416,400
5. Step 5: Solve for x
   x = 3,191,296,416,400/812,210
6. Step 6: Final answer
   x = 3,929,151.84