Finding the Third Proportional to 398,425 and 863,222

Step by Step Solution

1. Step 1: Write the proportion equation
   398,425 : 863,222 = 863,222 : x
2. Step 2: Convert to fraction form
   398,425/863,222 = 863,222/x
3. Step 3: Cross multiply
   398,425x = 863,222 × 863,222
4. Step 4: Simplify right side
   398,425x = 745,152,221,284
5. Step 5: Solve for x
   x = 745,152,221,284/398,425
6. Step 6: Final answer
   x = 1,870,244.64