Finding the Fourth Proportional to 3,684.72, 5,521.32 and 3,221.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,684.72 : 5,521.32 = 3,221.04 : x
2. Step 2: Convert to fraction form
   3,684.72/5,521.32 = 3,221.04/x
3. Step 3: Cross multiply
   3,684.72x = 5,521.32 × 3,221.04
4. Step 4: Simplify right side
   3,684.72x = 17,784,392.57
5. Step 5: Solve for x
   x = 17,784,392.57/3,684.72
6. Step 6: Final answer
   x = 4,826.52