Finding the Fourth Proportional to 11,217.89, 16,830.12 and 3,320.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,217.89 : 16,830.12 = 3,320.61 : x
2. Step 2: Convert to fraction form
   11,217.89/16,830.12 = 3,320.61/x
3. Step 3: Cross multiply
   11,217.89x = 16,830.12 × 3,320.61
4. Step 4: Simplify right side
   11,217.89x = 55,886,340.34
5. Step 5: Solve for x
   x = 55,886,340.34/11,217.89
6. Step 6: Final answer
   x = 4,981.89