Find the Fourth Proportional:
Finding the fourth proportional to given numbers involves finding a number that is in the same proportion to the third number as the second number is to the first number. In this case, we are given three numbers - 2/3, 3/7, and 4, and we need to find the fourth proportional to these numbers.

Step 1: Set up the Proportion
To find the fourth proportional, we set up a proportion using the three given numbers:
2/3 = 3/7 = 4/x

Step 2: Find the Common Ratio
To find the fourth proportional, we first need to find the common ratio between the second and third numbers:
3/7 = 4/x
3x = 28
x = 28/3
x = 9.33

Step 3: Calculate the Fourth Proportional
Now, we have found the value of x, which is the fourth proportional to the given numbers 2/3, 3/7, and 4. Therefore, the fourth proportional to these numbers is 9.33.

18/7