Finding the Fourth Proportional to 3,978.26, 5,488.76 and 2,299.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.26 : 5,488.76 = 2,299.05 : x
2. Step 2: Convert to fraction form
   3,978.26/5,488.76 = 2,299.05/x
3. Step 3: Cross multiply
   3,978.26x = 5,488.76 × 2,299.05
4. Step 4: Simplify right side
   3,978.26x = 12,618,933.68
5. Step 5: Solve for x
   x = 12,618,933.68/3,978.26
6. Step 6: Final answer
   x = 3,171.97