Finding the Fourth Proportional to 3,978.36, 5,490.52 and 2,210.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.36 : 5,490.52 = 2,210.54 : x
2. Step 2: Convert to fraction form
   3,978.36/5,490.52 = 2,210.54/x
3. Step 3: Cross multiply
   3,978.36x = 5,490.52 × 2,210.54
4. Step 4: Simplify right side
   3,978.36x = 12,137,014.08
5. Step 5: Solve for x
   x = 12,137,014.08/3,978.36
6. Step 6: Final answer
   x = 3,050.76