Finding the Fourth Proportional to 3,978.97, 5,490.87 and 2,210.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.97 : 5,490.87 = 2,210.53 : x
2. Step 2: Convert to fraction form
   3,978.97/5,490.87 = 2,210.53/x
3. Step 3: Cross multiply
   3,978.97x = 5,490.87 × 2,210.53
4. Step 4: Simplify right side
   3,978.97x = 12,137,732.86
5. Step 5: Solve for x
   x = 12,137,732.86/3,978.97
6. Step 6: Final answer
   x = 3,050.47