Finding the Fourth Proportional to 11,661, 17,493.12 and 3,867.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,661 : 17,493.12 = 3,867.72 : x
2. Step 2: Convert to fraction form
   11,661/17,493.12 = 3,867.72/x
3. Step 3: Cross multiply
   11,661x = 17,493.12 × 3,867.72
4. Step 4: Simplify right side
   11,661x = 67,658,490.09
5. Step 5: Solve for x
   x = 67,658,490.09/11,661
6. Step 6: Final answer
   x = 5,802.12