Finding the Fourth Proportional to 3,978.80, 5,490.84 and 2,210.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.80 : 5,490.84 = 2,210.48 : x
2. Step 2: Convert to fraction form
   3,978.80/5,490.84 = 2,210.48/x
3. Step 3: Cross multiply
   3,978.80x = 5,490.84 × 2,210.48
4. Step 4: Simplify right side
   3,978.80x = 12,137,392.00
5. Step 5: Solve for x
   x = 12,137,392.00/3,978.80
6. Step 6: Final answer
   x = 3,050.52