Finding the Third Proportional to 387,820 and 810,774

Step by Step Solution

1. Step 1: Write the proportion equation
   387,820 : 810,774 = 810,774 : x
2. Step 2: Convert to fraction form
   387,820/810,774 = 810,774/x
3. Step 3: Cross multiply
   387,820x = 810,774 × 810,774
4. Step 4: Simplify right side
   387,820x = 657,354,479,076
5. Step 5: Solve for x
   x = 657,354,479,076/387,820
6. Step 6: Final answer
   x = 1,694,998.91