Finding the Fourth Proportional to 3,978.47, 5,489.67 and 2,299.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.47 : 5,489.67 = 2,299.55 : x
2. Step 2: Convert to fraction form
   3,978.47/5,489.67 = 2,299.55/x
3. Step 3: Cross multiply
   3,978.47x = 5,489.67 × 2,299.55
4. Step 4: Simplify right side
   3,978.47x = 12,623,767.26
5. Step 5: Solve for x
   x = 12,623,767.26/3,978.47
6. Step 6: Final answer
   x = 3,173.02