Finding the Fourth Proportional to 3,978.79, 5,980.16 and 3,289.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.79 : 5,980.16 = 3,289.87 : x
2. Step 2: Convert to fraction form
   3,978.79/5,980.16 = 3,289.87/x
3. Step 3: Cross multiply
   3,978.79x = 5,980.16 × 3,289.87
4. Step 4: Simplify right side
   3,978.79x = 19,673,948.98
5. Step 5: Solve for x
   x = 19,673,948.98/3,978.79
6. Step 6: Final answer
   x = 4,944.71