Finding the Fourth Proportional to 3,287.52, 4,930.20 and 2,118.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,287.52 : 4,930.20 = 2,118.78 : x
2. Step 2: Convert to fraction form
   3,287.52/4,930.20 = 2,118.78/x
3. Step 3: Cross multiply
   3,287.52x = 4,930.20 × 2,118.78
4. Step 4: Simplify right side
   3,287.52x = 10,446,009.16
5. Step 5: Solve for x
   x = 10,446,009.16/3,287.52
6. Step 6: Final answer
   x = 3,177.47