Finding the Fourth Proportional to 2,188.78, 3,018.06 and 1,789.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.78 : 3,018.06 = 1,789.20 : x
2. Step 2: Convert to fraction form
   2,188.78/3,018.06 = 1,789.20/x
3. Step 3: Cross multiply
   2,188.78x = 3,018.06 × 1,789.20
4. Step 4: Simplify right side
   2,188.78x = 5,399,912.95
5. Step 5: Solve for x
   x = 5,399,912.95/2,188.78
6. Step 6: Final answer
   x = 2,467.09