Finding the Fourth Proportional to 11,819.55, 17,730.46 and 3,920.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,819.55 : 17,730.46 = 3,920.40 : x
2. Step 2: Convert to fraction form
   11,819.55/17,730.46 = 3,920.40/x
3. Step 3: Cross multiply
   11,819.55x = 17,730.46 × 3,920.40
4. Step 4: Simplify right side
   11,819.55x = 69,510,500.28
5. Step 5: Solve for x
   x = 69,510,500.28/11,819.55
6. Step 6: Final answer
   x = 5,880.98