Finding the Fourth Proportional to 11,981.06, 17,971.57 and 3,661.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,981.06 : 17,971.57 = 3,661.10 : x
2. Step 2: Convert to fraction form
   11,981.06/17,971.57 = 3,661.10/x
3. Step 3: Cross multiply
   11,981.06x = 17,971.57 × 3,661.10
4. Step 4: Simplify right side
   11,981.06x = 65,795,714.93
5. Step 5: Solve for x
   x = 65,795,714.93/11,981.06
6. Step 6: Final answer
   x = 5,491.64