Finding the Fourth Proportional to 5,218.78, 7,828.15 and 1,323.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,218.78 : 7,828.15 = 1,323.18 : x
2. Step 2: Convert to fraction form
   5,218.78/7,828.15 = 1,323.18/x
3. Step 3: Cross multiply
   5,218.78x = 7,828.15 × 1,323.18
4. Step 4: Simplify right side
   5,218.78x = 10,358,051.52
5. Step 5: Solve for x
   x = 10,358,051.52/5,218.78
6. Step 6: Final answer
   x = 1,984.76