Finding the Fourth Proportional to 3,978.20, 5,490.57 and 2,210.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.20 : 5,490.57 = 2,210.37 : x
2. Step 2: Convert to fraction form
   3,978.20/5,490.57 = 2,210.37/x
3. Step 3: Cross multiply
   3,978.20x = 5,490.57 × 2,210.37
4. Step 4: Simplify right side
   3,978.20x = 12,136,191.21
5. Step 5: Solve for x
   x = 12,136,191.21/3,978.20
6. Step 6: Final answer
   x = 3,050.68