Finding the Fourth Proportional to 3,978.83, 5,490.91 and 2,210.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.83 : 5,490.91 = 2,210.57 : x
2. Step 2: Convert to fraction form
   3,978.83/5,490.91 = 2,210.57/x
3. Step 3: Cross multiply
   3,978.83x = 5,490.91 × 2,210.57
4. Step 4: Simplify right side
   3,978.83x = 12,138,040.92
5. Step 5: Solve for x
   x = 12,138,040.92/3,978.83
6. Step 6: Final answer
   x = 3,050.66