Finding the Fourth Proportional to 3,978.58, 5,490.56 and 2,210.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.58 : 5,490.56 = 2,210.33 : x
2. Step 2: Convert to fraction form
   3,978.58/5,490.56 = 2,210.33/x
3. Step 3: Cross multiply
   3,978.58x = 5,490.56 × 2,210.33
4. Step 4: Simplify right side
   3,978.58x = 12,135,927.56
5. Step 5: Solve for x
   x = 12,135,927.56/3,978.58
6. Step 6: Final answer
   x = 3,050.32