Finding the Fourth Proportional to 3,978.68, 5,490.83 and 2,210.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.68 : 5,490.83 = 2,210.30 : x
2. Step 2: Convert to fraction form
   3,978.68/5,490.83 = 2,210.30/x
3. Step 3: Cross multiply
   3,978.68x = 5,490.83 × 2,210.30
4. Step 4: Simplify right side
   3,978.68x = 12,136,359.62
5. Step 5: Solve for x
   x = 12,136,359.62/3,978.68
6. Step 6: Final answer
   x = 3,050.35