Finding the Fourth Proportional to 3,978.56, 5,490.52 and 2,210.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.56 : 5,490.52 = 2,210.12 : x
2. Step 2: Convert to fraction form
   3,978.56/5,490.52 = 2,210.12/x
3. Step 3: Cross multiply
   3,978.56x = 5,490.52 × 2,210.12
4. Step 4: Simplify right side
   3,978.56x = 12,134,708.06
5. Step 5: Solve for x
   x = 12,134,708.06/3,978.56
6. Step 6: Final answer
   x = 3,050.03