Finding the Fourth Proportional to 2,182.25, 3,273.98 and 643.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,182.25 : 3,273.98 = 643.25 : x
2. Step 2: Convert to fraction form
   2,182.25/3,273.98 = 643.25/x
3. Step 3: Cross multiply
   2,182.25x = 3,273.98 × 643.25
4. Step 4: Simplify right side
   2,182.25x = 2,105,984.42
5. Step 5: Solve for x
   x = 2,105,984.42/2,182.25
6. Step 6: Final answer
   x = 965.05