Finding the Fourth Proportional to 11,819.57, 17,730.31 and 3,921.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,819.57 : 17,730.31 = 3,921.76 : x
2. Step 2: Convert to fraction form
   11,819.57/17,730.31 = 3,921.76/x
3. Step 3: Cross multiply
   11,819.57x = 17,730.31 × 3,921.76
4. Step 4: Simplify right side
   11,819.57x = 69,534,020.55
5. Step 5: Solve for x
   x = 69,534,020.55/11,819.57
6. Step 6: Final answer
   x = 5,882.96