Finding the Third Proportional to 387,388 and 839,116

Step by Step Solution

1. Step 1: Write the proportion equation
   387,388 : 839,116 = 839,116 : x
2. Step 2: Convert to fraction form
   387,388/839,116 = 839,116/x
3. Step 3: Cross multiply
   387,388x = 839,116 × 839,116
4. Step 4: Simplify right side
   387,388x = 704,115,661,456
5. Step 5: Solve for x
   x = 704,115,661,456/387,388
6. Step 6: Final answer
   x = 1,817,598.02