Finding the Fourth Proportional to 3,978.55, 5,490.16 and 2,210.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.55 : 5,490.16 = 2,210.05 : x
2. Step 2: Convert to fraction form
   3,978.55/5,490.16 = 2,210.05/x
3. Step 3: Cross multiply
   3,978.55x = 5,490.16 × 2,210.05
4. Step 4: Simplify right side
   3,978.55x = 12,133,528.11
5. Step 5: Solve for x
   x = 12,133,528.11/3,978.55
6. Step 6: Final answer
   x = 3,049.74