Finding the Fourth Proportional to 2,621.89, 3,934.40 and 979.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.89 : 3,934.40 = 979.59 : x
2. Step 2: Convert to fraction form
   2,621.89/3,934.40 = 979.59/x
3. Step 3: Cross multiply
   2,621.89x = 3,934.40 × 979.59
4. Step 4: Simplify right side
   2,621.89x = 3,854,098.90
5. Step 5: Solve for x
   x = 3,854,098.90/2,621.89
6. Step 6: Final answer
   x = 1,469.97