Finding the Third Proportional to 646,488 and 1,375,920

Step by Step Solution

1. Step 1: Write the proportion equation
   646,488 : 1,375,920 = 1,375,920 : x
2. Step 2: Convert to fraction form
   646,488/1,375,920 = 1,375,920/x
3. Step 3: Cross multiply
   646,488x = 1,375,920 × 1,375,920
4. Step 4: Simplify right side
   646,488x = 1,893,155,846,400
5. Step 5: Solve for x
   x = 1,893,155,846,400/646,488
6. Step 6: Final answer
   x = 2,928,369.66