Finding the Fourth Proportional to 2,621.42, 3,934.55 and 1,323.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.42 : 3,934.55 = 1,323.80 : x
2. Step 2: Convert to fraction form
   2,621.42/3,934.55 = 1,323.80/x
3. Step 3: Cross multiply
   2,621.42x = 3,934.55 × 1,323.80
4. Step 4: Simplify right side
   2,621.42x = 5,208,540.93
5. Step 5: Solve for x
   x = 5,208,540.93/2,621.42
6. Step 6: Final answer
   x = 1,986.92