Finding the Fourth Proportional to 11,986.10, 17,981.88 and 3,667.29

Step by Step Solution

1. Step 1: Write the proportion equation
   11,986.10 : 17,981.88 = 3,667.29 : x
2. Step 2: Convert to fraction form
   11,986.10/17,981.88 = 3,667.29/x
3. Step 3: Cross multiply
   11,986.10x = 17,981.88 × 3,667.29
4. Step 4: Simplify right side
   11,986.10x = 65,944,768.71
5. Step 5: Solve for x
   x = 65,944,768.71/11,986.10
6. Step 6: Final answer
   x = 5,501.77