Finding the Fourth Proportional to 2,072.75, 3,107.72 and 822.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.75 : 3,107.72 = 822.51 : x
2. Step 2: Convert to fraction form
   2,072.75/3,107.72 = 822.51/x
3. Step 3: Cross multiply
   2,072.75x = 3,107.72 × 822.51
4. Step 4: Simplify right side
   2,072.75x = 2,556,132.83
5. Step 5: Solve for x
   x = 2,556,132.83/2,072.75
6. Step 6: Final answer
   x = 1,233.21