Finding the Fourth Proportional to 3,678.48, 5,076.30 and 3,399.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.48 : 5,076.30 = 3,399.42 : x
2. Step 2: Convert to fraction form
   3,678.48/5,076.30 = 3,399.42/x
3. Step 3: Cross multiply
   3,678.48x = 5,076.30 × 3,399.42
4. Step 4: Simplify right side
   3,678.48x = 17,256,475.75
5. Step 5: Solve for x
   x = 17,256,475.75/3,678.48
6. Step 6: Final answer
   x = 4,691.20