Finding the Third Proportional to 645,431 and 1,402,805

Step by Step Solution

1. Step 1: Write the proportion equation
   645,431 : 1,402,805 = 1,402,805 : x
2. Step 2: Convert to fraction form
   645,431/1,402,805 = 1,402,805/x
3. Step 3: Cross multiply
   645,431x = 1,402,805 × 1,402,805
4. Step 4: Simplify right side
   645,431x = 1,967,861,868,025
5. Step 5: Solve for x
   x = 1,967,861,868,025/645,431
6. Step 6: Final answer
   x = 3,048,911.30