Finding the Fourth Proportional to 3,978.54, 5,490.05 and 2,210.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.54 : 5,490.05 = 2,210.18 : x
2. Step 2: Convert to fraction form
   3,978.54/5,490.05 = 2,210.18/x
3. Step 3: Cross multiply
   3,978.54x = 5,490.05 × 2,210.18
4. Step 4: Simplify right side
   3,978.54x = 12,133,960.21
5. Step 5: Solve for x
   x = 12,133,960.21/3,978.54
6. Step 6: Final answer
   x = 3,049.85