Finding the Fourth Proportional to 11,871.72, 17,806.32 and 3,105.48

Step by Step Solution

1. Step 1: Write the proportion equation
   11,871.72 : 17,806.32 = 3,105.48 : x
2. Step 2: Convert to fraction form
   11,871.72/17,806.32 = 3,105.48/x
3. Step 3: Cross multiply
   11,871.72x = 17,806.32 × 3,105.48
4. Step 4: Simplify right side
   11,871.72x = 55,297,170.63
5. Step 5: Solve for x
   x = 55,297,170.63/11,871.72
6. Step 6: Final answer
   x = 4,657.89