Finding the Third Proportional to 643,422 and 1,397,436

Step by Step Solution

1. Step 1: Write the proportion equation
   643,422 : 1,397,436 = 1,397,436 : x
2. Step 2: Convert to fraction form
   643,422/1,397,436 = 1,397,436/x
3. Step 3: Cross multiply
   643,422x = 1,397,436 × 1,397,436
4. Step 4: Simplify right side
   643,422x = 1,952,827,374,096
5. Step 5: Solve for x
   x = 1,952,827,374,096/643,422
6. Step 6: Final answer
   x = 3,035,064.66