Finding the Third Proportional to 812,355 and 1,257,231

Step by Step Solution

1. Step 1: Write the proportion equation
   812,355 : 1,257,231 = 1,257,231 : x
2. Step 2: Convert to fraction form
   812,355/1,257,231 = 1,257,231/x
3. Step 3: Cross multiply
   812,355x = 1,257,231 × 1,257,231
4. Step 4: Simplify right side
   812,355x = 1,580,629,787,361
5. Step 5: Solve for x
   x = 1,580,629,787,361/812,355
6. Step 6: Final answer
   x = 1,945,737.75