Finding the Third Proportional to 683,638 and 1,490,290

Step by Step Solution

1. Step 1: Write the proportion equation
   683,638 : 1,490,290 = 1,490,290 : x
2. Step 2: Convert to fraction form
   683,638/1,490,290 = 1,490,290/x
3. Step 3: Cross multiply
   683,638x = 1,490,290 × 1,490,290
4. Step 4: Simplify right side
   683,638x = 2,220,964,284,100
5. Step 5: Solve for x
   x = 2,220,964,284,100/683,638
6. Step 6: Final answer
   x = 3,248,743.17