Finding the Third Proportional to 645,409 and 1,402,760

Step by Step Solution

1. Step 1: Write the proportion equation
   645,409 : 1,402,760 = 1,402,760 : x
2. Step 2: Convert to fraction form
   645,409/1,402,760 = 1,402,760/x
3. Step 3: Cross multiply
   645,409x = 1,402,760 × 1,402,760
4. Step 4: Simplify right side
   645,409x = 1,967,735,617,600
5. Step 5: Solve for x
   x = 1,967,735,617,600/645,409
6. Step 6: Final answer
   x = 3,048,819.61