Finding the Fourth Proportional to 3,978.88, 5,490.80 and 2,210.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.88 : 5,490.80 = 2,210.52 : x
2. Step 2: Convert to fraction form
   3,978.88/5,490.80 = 2,210.52/x
3. Step 3: Cross multiply
   3,978.88x = 5,490.80 × 2,210.52
4. Step 4: Simplify right side
   3,978.88x = 12,137,523.22
5. Step 5: Solve for x
   x = 12,137,523.22/3,978.88
6. Step 6: Final answer
   x = 3,050.49