Finding the Fourth Proportional to 11,662.76, 17,490.09 and 3,869.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,662.76 : 17,490.09 = 3,869.75 : x
2. Step 2: Convert to fraction form
   11,662.76/17,490.09 = 3,869.75/x
3. Step 3: Cross multiply
   11,662.76x = 17,490.09 × 3,869.75
4. Step 4: Simplify right side
   11,662.76x = 67,682,275.78
5. Step 5: Solve for x
   x = 67,682,275.78/11,662.76
6. Step 6: Final answer
   x = 5,803.28