Finding the Fourth Proportional to 2,188.56, 3,280.84 and 1,018.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.56 : 3,280.84 = 1,018.12 : x
2. Step 2: Convert to fraction form
   2,188.56/3,280.84 = 1,018.12/x
3. Step 3: Cross multiply
   2,188.56x = 3,280.84 × 1,018.12
4. Step 4: Simplify right side
   2,188.56x = 3,340,288.82
5. Step 5: Solve for x
   x = 3,340,288.82/2,188.56
6. Step 6: Final answer
   x = 1,526.25