Finding the Fourth Proportional to 1,771.72, 2,644.61 and 1,643.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,771.72 : 2,644.61 = 1,643.22 : x
2. Step 2: Convert to fraction form
   1,771.72/2,644.61 = 1,643.22/x
3. Step 3: Cross multiply
   1,771.72x = 2,644.61 × 1,643.22
4. Step 4: Simplify right side
   1,771.72x = 4,345,676.04
5. Step 5: Solve for x
   x = 4,345,676.04/1,771.72
6. Step 6: Final answer
   x = 2,452.80