Finding the Fourth Proportional to 3,978.63, 5,490.63 and 2,210.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.63 : 5,490.63 = 2,210.40 : x
2. Step 2: Convert to fraction form
   3,978.63/5,490.63 = 2,210.40/x
3. Step 3: Cross multiply
   3,978.63x = 5,490.63 × 2,210.40
4. Step 4: Simplify right side
   3,978.63x = 12,136,488.55
5. Step 5: Solve for x
   x = 12,136,488.55/3,978.63
6. Step 6: Final answer
   x = 3,050.42