Finding the Third Proportional to 389,216 and 839,200

Step by Step Solution

1. Step 1: Write the proportion equation
   389,216 : 839,200 = 839,200 : x
2. Step 2: Convert to fraction form
   389,216/839,200 = 839,200/x
3. Step 3: Cross multiply
   389,216x = 839,200 × 839,200
4. Step 4: Simplify right side
   389,216x = 704,256,640,000
5. Step 5: Solve for x
   x = 704,256,640,000/389,216
6. Step 6: Final answer
   x = 1,809,423.66