Finding the Fourth Proportional to 3,989.52, 5,974.56 and 3,872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.52 : 5,974.56 = 3,872.88 : x
2. Step 2: Convert to fraction form
   3,989.52/5,974.56 = 3,872.88/x
3. Step 3: Cross multiply
   3,989.52x = 5,974.56 × 3,872.88
4. Step 4: Simplify right side
   3,989.52x = 23,138,753.93
5. Step 5: Solve for x
   x = 23,138,753.93/3,989.52
6. Step 6: Final answer
   x = 5,799.88