Finding the Fourth Proportional to 3,978.01, 5,484.61 and 2,845.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.01 : 5,484.61 = 2,845.05 : x
2. Step 2: Convert to fraction form
   3,978.01/5,484.61 = 2,845.05/x
3. Step 3: Cross multiply
   3,978.01x = 5,484.61 × 2,845.05
4. Step 4: Simplify right side
   3,978.01x = 15,603,989.68
5. Step 5: Solve for x
   x = 15,603,989.68/3,978.01
6. Step 6: Final answer
   x = 3,922.56