Finding the Fourth Proportional to 3,978.47, 5,490.30 and 2,210.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.47 : 5,490.30 = 2,210.07 : x
2. Step 2: Convert to fraction form
   3,978.47/5,490.30 = 2,210.07/x
3. Step 3: Cross multiply
   3,978.47x = 5,490.30 × 2,210.07
4. Step 4: Simplify right side
   3,978.47x = 12,133,947.32
5. Step 5: Solve for x
   x = 12,133,947.32/3,978.47
6. Step 6: Final answer
   x = 3,049.90