Finding the Third Proportional to 199,809 and 428,046.75

Step by Step Solution

1. Step 1: Write the proportion equation
   199,809 : 428,046.75 = 428,046.75 : x
2. Step 2: Convert to fraction form
   199,809/428,046.75 = 428,046.75/x
3. Step 3: Cross multiply
   199,809x = 428,046.75 × 428,046.75
4. Step 4: Simplify right side
   199,809x = 183,224,020,185.56
5. Step 5: Solve for x
   x = 183,224,020,185.56/199,809
6. Step 6: Final answer
   x = 916,995.83