Finding the Fourth Proportional to 3,978.60, 5,490.40 and 2,210.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.60 : 5,490.40 = 2,210.16 : x
2. Step 2: Convert to fraction form
   3,978.60/5,490.40 = 2,210.16/x
3. Step 3: Cross multiply
   3,978.60x = 5,490.40 × 2,210.16
4. Step 4: Simplify right side
   3,978.60x = 12,134,662.46
5. Step 5: Solve for x
   x = 12,134,662.46/3,978.60
6. Step 6: Final answer
   x = 3,049.98