Finding the Fourth Proportional to 3,721.86, 5,123.28 and 3,217.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,721.86 : 5,123.28 = 3,217.48 : x
2. Step 2: Convert to fraction form
   3,721.86/5,123.28 = 3,217.48/x
3. Step 3: Cross multiply
   3,721.86x = 5,123.28 × 3,217.48
4. Step 4: Simplify right side
   3,721.86x = 16,484,050.93
5. Step 5: Solve for x
   x = 16,484,050.93/3,721.86
6. Step 6: Final answer
   x = 4,428.98