Finding the Fourth Proportional to 3,680.28, 5,078.39 and 2,188.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.28 : 5,078.39 = 2,188.00 : x
2. Step 2: Convert to fraction form
   3,680.28/5,078.39 = 2,188.00/x
3. Step 3: Cross multiply
   3,680.28x = 5,078.39 × 2,188.00
4. Step 4: Simplify right side
   3,680.28x = 11,111,491.93
5. Step 5: Solve for x
   x = 11,111,491.93/3,680.28
6. Step 6: Final answer
   x = 3,019.20