Finding the Fourth Proportional to 3,978.81, 5,490.45 and 2,210.26

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.81 : 5,490.45 = 2,210.26 : x
2. Step 2: Convert to fraction form
   3,978.81/5,490.45 = 2,210.26/x
3. Step 3: Cross multiply
   3,978.81x = 5,490.45 × 2,210.26
4. Step 4: Simplify right side
   3,978.81x = 12,135,322.02
5. Step 5: Solve for x
   x = 12,135,322.02/3,978.81
6. Step 6: Final answer
   x = 3,049.99