Finding the Fourth Proportional to 8,490.89, 12,732.24 and 3,559.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,490.89 : 12,732.24 = 3,559.21 : x
2. Step 2: Convert to fraction form
   8,490.89/12,732.24 = 3,559.21/x
3. Step 3: Cross multiply
   8,490.89x = 12,732.24 × 3,559.21
4. Step 4: Simplify right side
   8,490.89x = 45,316,684.10
5. Step 5: Solve for x
   x = 45,316,684.10/8,490.89
6. Step 6: Final answer
   x = 5,337.09