Finding the Third Proportional to 387,770 and 820,250

Step by Step Solution

1. Step 1: Write the proportion equation
   387,770 : 820,250 = 820,250 : x
2. Step 2: Convert to fraction form
   387,770/820,250 = 820,250/x
3. Step 3: Cross multiply
   387,770x = 820,250 × 820,250
4. Step 4: Simplify right side
   387,770x = 672,810,062,500
5. Step 5: Solve for x
   x = 672,810,062,500/387,770
6. Step 6: Final answer
   x = 1,735,075.08