Finding the Fourth Proportional to 2,621.94, 3,934.71 and 979.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.94 : 3,934.71 = 979.80 : x
2. Step 2: Convert to fraction form
   2,621.94/3,934.71 = 979.80/x
3. Step 3: Cross multiply
   2,621.94x = 3,934.71 × 979.80
4. Step 4: Simplify right side
   2,621.94x = 3,855,228.86
5. Step 5: Solve for x
   x = 3,855,228.86/2,621.94
6. Step 6: Final answer
   x = 1,470.37