Finding the Fourth Proportional to 2,421.37, 3,628.86 and 959.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.37 : 3,628.86 = 959.72 : x
2. Step 2: Convert to fraction form
   2,421.37/3,628.86 = 959.72/x
3. Step 3: Cross multiply
   2,421.37x = 3,628.86 × 959.72
4. Step 4: Simplify right side
   2,421.37x = 3,482,698.59
5. Step 5: Solve for x
   x = 3,482,698.59/2,421.37
6. Step 6: Final answer
   x = 1,438.32