Finding the Fourth Proportional to 3,978.69, 5,490.59 and 2,210.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.69 : 5,490.59 = 2,210.46 : x
2. Step 2: Convert to fraction form
   3,978.69/5,490.59 = 2,210.46/x
3. Step 3: Cross multiply
   3,978.69x = 5,490.59 × 2,210.46
4. Step 4: Simplify right side
   3,978.69x = 12,136,729.57
5. Step 5: Solve for x
   x = 12,136,729.57/3,978.69
6. Step 6: Final answer
   x = 3,050.43