Finding the Third Proportional to 639,201 and 1,420,290

Step by Step Solution

1. Step 1: Write the proportion equation
   639,201 : 1,420,290 = 1,420,290 : x
2. Step 2: Convert to fraction form
   639,201/1,420,290 = 1,420,290/x
3. Step 3: Cross multiply
   639,201x = 1,420,290 × 1,420,290
4. Step 4: Simplify right side
   639,201x = 2,017,223,684,100
5. Step 5: Solve for x
   x = 2,017,223,684,100/639,201
6. Step 6: Final answer
   x = 3,155,851.89