Finding the Fourth Proportional to 3,978.99, 5,490.92 and 2,210.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.99 : 5,490.92 = 2,210.56 : x
2. Step 2: Convert to fraction form
   3,978.99/5,490.92 = 2,210.56/x
3. Step 3: Cross multiply
   3,978.99x = 5,490.92 × 2,210.56
4. Step 4: Simplify right side
   3,978.99x = 12,137,999.91
5. Step 5: Solve for x
   x = 12,137,999.91/3,978.99
6. Step 6: Final answer
   x = 3,050.52