Finding the Fourth Proportional to 3,978.45, 5,490.07 and 2,210.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.45 : 5,490.07 = 2,210.02 : x
2. Step 2: Convert to fraction form
   3,978.45/5,490.07 = 2,210.02/x
3. Step 3: Cross multiply
   3,978.45x = 5,490.07 × 2,210.02
4. Step 4: Simplify right side
   3,978.45x = 12,133,164.50
5. Step 5: Solve for x
   x = 12,133,164.50/3,978.45
6. Step 6: Final answer
   x = 3,049.72