Finding the Third Proportional to 645,422 and 1,399,706

Step by Step Solution

1. Step 1: Write the proportion equation
   645,422 : 1,399,706 = 1,399,706 : x
2. Step 2: Convert to fraction form
   645,422/1,399,706 = 1,399,706/x
3. Step 3: Cross multiply
   645,422x = 1,399,706 × 1,399,706
4. Step 4: Simplify right side
   645,422x = 1,959,176,886,436
5. Step 5: Solve for x
   x = 1,959,176,886,436/645,422
6. Step 6: Final answer
   x = 3,035,497.53