(0.785) (D squared) = 5024 solve for x?

It appears that there might be a typo in your question. You've written "(0.785) (D squared) = 5024 solve for x?" but it seems like you're mixing variables D and x. I'm going to assume you meant to solve for D, since that's the variable present in the equation.

Given the equation (0.785) * (D^2) = 5024, you want to find the value of D. To do this, follow these steps:

Step 1: Divide both sides of the equation by 0.785 to isolate D^2. (0.785) * (D^2) / 0.785 = 5024 / 0.785

Step 2: Calculate the right-hand side to determine what (D^2) equals. D^2 = 5024 / 0.785

Step 3: Use a calculator to find the result of the division. D^2 ≈ 6397.452229299363 (You should use your calculator to get a precise result if needed).

Step 4: Take the square root of both sides to solve for D. D = sqrt(6397.452229299363)

Step 5: Calculate the square root to find D. D ≈ 79.985 (rounded to three decimal places)

So the approximate value of D is 79.985.