Finding the Fourth Proportional to 2,188.78, 3,020.58 and 1,304.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.78 : 3,020.58 = 1,304.68 : x
2. Step 2: Convert to fraction form
   2,188.78/3,020.58 = 1,304.68/x
3. Step 3: Cross multiply
   2,188.78x = 3,020.58 × 1,304.68
4. Step 4: Simplify right side
   2,188.78x = 3,940,890.31
5. Step 5: Solve for x
   x = 3,940,890.31/2,188.78
6. Step 6: Final answer
   x = 1,800.50