Finding the Fourth Proportional to 2,478.28, 3,715.98 and 1,323.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.28 : 3,715.98 = 1,323.40 : x
2. Step 2: Convert to fraction form
   2,478.28/3,715.98 = 1,323.40/x
3. Step 3: Cross multiply
   2,478.28x = 3,715.98 × 1,323.40
4. Step 4: Simplify right side
   2,478.28x = 4,917,727.93
5. Step 5: Solve for x
   x = 4,917,727.93/2,478.28
6. Step 6: Final answer
   x = 1,984.33