Finding the Third Proportional to 638,408 and 1,370,898

Step by Step Solution

1. Step 1: Write the proportion equation
   638,408 : 1,370,898 = 1,370,898 : x
2. Step 2: Convert to fraction form
   638,408/1,370,898 = 1,370,898/x
3. Step 3: Cross multiply
   638,408x = 1,370,898 × 1,370,898
4. Step 4: Simplify right side
   638,408x = 1,879,361,326,404
5. Step 5: Solve for x
   x = 1,879,361,326,404/638,408
6. Step 6: Final answer
   x = 2,943,824.84