Finding the Fourth Proportional to 11,760.82, 17,638.47 and 3,439.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,760.82 : 17,638.47 = 3,439.09 : x
2. Step 2: Convert to fraction form
   11,760.82/17,638.47 = 3,439.09/x
3. Step 3: Cross multiply
   11,760.82x = 17,638.47 × 3,439.09
4. Step 4: Simplify right side
   11,760.82x = 60,660,285.79
5. Step 5: Solve for x
   x = 60,660,285.79/11,760.82
6. Step 6: Final answer
   x = 5,157.83