Finding the Fourth Proportional to 3,628.78, 5,443.50 and 1,288.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,628.78 : 5,443.50 = 1,288.55 : x
2. Step 2: Convert to fraction form
   3,628.78/5,443.50 = 1,288.55/x
3. Step 3: Cross multiply
   3,628.78x = 5,443.50 × 1,288.55
4. Step 4: Simplify right side
   3,628.78x = 7,014,221.93
5. Step 5: Solve for x
   x = 7,014,221.93/3,628.78
6. Step 6: Final answer
   x = 1,932.94