Finding the Fourth Proportional to 2,028.72, 3,043.38 and 641.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,028.72 : 3,043.38 = 641.75 : x
2. Step 2: Convert to fraction form
   2,028.72/3,043.38 = 641.75/x
3. Step 3: Cross multiply
   2,028.72x = 3,043.38 × 641.75
4. Step 4: Simplify right side
   2,028.72x = 1,953,075.50
5. Step 5: Solve for x
   x = 1,953,075.50/2,028.72
6. Step 6: Final answer
   x = 962.71