Finding the Third Proportional to 363,621 and 777,786

Step by Step Solution

1. Step 1: Write the proportion equation
   363,621 : 777,786 = 777,786 : x
2. Step 2: Convert to fraction form
   363,621/777,786 = 777,786/x
3. Step 3: Cross multiply
   363,621x = 777,786 × 777,786
4. Step 4: Simplify right side
   363,621x = 604,951,061,796
5. Step 5: Solve for x
   x = 604,951,061,796/363,621
6. Step 6: Final answer
   x = 1,663,685.71