Finding the Third Proportional to 387,385 and 839,111

Step by Step Solution

1. Step 1: Write the proportion equation
   387,385 : 839,111 = 839,111 : x
2. Step 2: Convert to fraction form
   387,385/839,111 = 839,111/x
3. Step 3: Cross multiply
   387,385x = 839,111 × 839,111
4. Step 4: Simplify right side
   387,385x = 704,107,270,321
5. Step 5: Solve for x
   x = 704,107,270,321/387,385
6. Step 6: Final answer
   x = 1,817,590.43