Finding the Fourth Proportional to 11,079.50, 16,620.90 and 3,580.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,079.50 : 16,620.90 = 3,580.55 : x
2. Step 2: Convert to fraction form
   11,079.50/16,620.90 = 3,580.55/x
3. Step 3: Cross multiply
   11,079.50x = 16,620.90 × 3,580.55
4. Step 4: Simplify right side
   11,079.50x = 59,511,880.39
5. Step 5: Solve for x
   x = 59,511,880.39/11,079.50
6. Step 6: Final answer
   x = 5,371.35