Finding the Fourth Proportional to 3,978.80, 5,493.24 and 3,604.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.80 : 5,493.24 = 3,604.40 : x
2. Step 2: Convert to fraction form
   3,978.80/5,493.24 = 3,604.40/x
3. Step 3: Cross multiply
   3,978.80x = 5,493.24 × 3,604.40
4. Step 4: Simplify right side
   3,978.80x = 19,799,834.26
5. Step 5: Solve for x
   x = 19,799,834.26/3,978.80
6. Step 6: Final answer
   x = 4,976.33