Finding the Fourth Proportional to 3,989.20, 5,996.76 and 3,969.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.20 : 5,996.76 = 3,969.76 : x
2. Step 2: Convert to fraction form
   3,989.20/5,996.76 = 3,969.76/x
3. Step 3: Cross multiply
   3,989.20x = 5,996.76 × 3,969.76
4. Step 4: Simplify right side
   3,989.20x = 23,805,697.98
5. Step 5: Solve for x
   x = 23,805,697.98/3,989.20
6. Step 6: Final answer
   x = 5,967.54