Finding the Fourth Proportional to 3,978.86, 5,490.36 and 2,210.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.86 : 5,490.36 = 2,210.04 : x
2. Step 2: Convert to fraction form
   3,978.86/5,490.36 = 2,210.04/x
3. Step 3: Cross multiply
   3,978.86x = 5,490.36 × 2,210.04
4. Step 4: Simplify right side
   3,978.86x = 12,133,915.21
5. Step 5: Solve for x
   x = 12,133,915.21/3,978.86
6. Step 6: Final answer
   x = 3,049.60