Finding the Third Proportional to 679,398 and 1,388,280

Step by Step Solution

1. Step 1: Write the proportion equation
   679,398 : 1,388,280 = 1,388,280 : x
2. Step 2: Convert to fraction form
   679,398/1,388,280 = 1,388,280/x
3. Step 3: Cross multiply
   679,398x = 1,388,280 × 1,388,280
4. Step 4: Simplify right side
   679,398x = 1,927,321,358,400
5. Step 5: Solve for x
   x = 1,927,321,358,400/679,398
6. Step 6: Final answer
   x = 2,836,807.52