Finding the Fourth Proportional to 2,628.42, 3,942.90 and 1,329.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.42 : 3,942.90 = 1,329.72 : x
2. Step 2: Convert to fraction form
   2,628.42/3,942.90 = 1,329.72/x
3. Step 3: Cross multiply
   2,628.42x = 3,942.90 × 1,329.72
4. Step 4: Simplify right side
   2,628.42x = 5,242,952.99
5. Step 5: Solve for x
   x = 5,242,952.99/2,628.42
6. Step 6: Final answer
   x = 1,994.72