Finding the Fourth Proportional to 3,978.61, 5,490.66 and 2,210.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.61 : 5,490.66 = 2,210.38 : x
2. Step 2: Convert to fraction form
   3,978.61/5,490.66 = 2,210.38/x
3. Step 3: Cross multiply
   3,978.61x = 5,490.66 × 2,210.38
4. Step 4: Simplify right side
   3,978.61x = 12,136,445.05
5. Step 5: Solve for x
   x = 12,136,445.05/3,978.61
6. Step 6: Final answer
   x = 3,050.42