Finding the Fourth Proportional to 3,978.69, 5,490.63 and 2,210.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.69 : 5,490.63 = 2,210.47 : x
2. Step 2: Convert to fraction form
   3,978.69/5,490.63 = 2,210.47/x
3. Step 3: Cross multiply
   3,978.69x = 5,490.63 × 2,210.47
4. Step 4: Simplify right side
   3,978.69x = 12,136,861.84
5. Step 5: Solve for x
   x = 12,136,861.84/3,978.69
6. Step 6: Final answer
   x = 3,050.47