Finding the Fourth Proportional to 2,104.37, 3,156.56 and 643.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.37 : 3,156.56 = 643.52 : x
2. Step 2: Convert to fraction form
   2,104.37/3,156.56 = 643.52/x
3. Step 3: Cross multiply
   2,104.37x = 3,156.56 × 643.52
4. Step 4: Simplify right side
   2,104.37x = 2,031,301.60
5. Step 5: Solve for x
   x = 2,031,301.60/2,104.37
6. Step 6: Final answer
   x = 965.28