(5 x 10,000)+( 4 x 1,000)+(5 x 100)+(2 x 10)+(4 x 1)+(3 x 0.1)+(2 x 0.01) in standard form

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?