Finding the Third Proportional to 339,361.88 and 670,158

Step by Step Solution

1. Step 1: Write the proportion equation
   339,361.88 : 670,158 = 670,158 : x
2. Step 2: Convert to fraction form
   339,361.88/670,158 = 670,158/x
3. Step 3: Cross multiply
   339,361.88x = 670,158 × 670,158
4. Step 4: Simplify right side
   339,361.88x = 449,111,744,964
5. Step 5: Solve for x
   x = 449,111,744,964/339,361.88
6. Step 6: Final answer
   x = 1,323,400.71