Finding the Third Proportional to 387,412 and 839,155

Step by Step Solution

1. Step 1: Write the proportion equation
   387,412 : 839,155 = 839,155 : x
2. Step 2: Convert to fraction form
   387,412/839,155 = 839,155/x
3. Step 3: Cross multiply
   387,412x = 839,155 × 839,155
4. Step 4: Simplify right side
   387,412x = 704,181,114,025
5. Step 5: Solve for x
   x = 704,181,114,025/387,412
6. Step 6: Final answer
   x = 1,817,654.37