Finding the Fourth Proportional to 3,147.38, 4,715.82 and 2,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,147.38 : 4,715.82 = 2,221.42 : x
2. Step 2: Convert to fraction form
   3,147.38/4,715.82 = 2,221.42/x
3. Step 3: Cross multiply
   3,147.38x = 4,715.82 × 2,221.42
4. Step 4: Simplify right side
   3,147.38x = 10,475,816.86
5. Step 5: Solve for x
   x = 10,475,816.86/3,147.38
6. Step 6: Final answer
   x = 3,328.42