Finding the Fourth Proportional to 11,986.56, 17,975.52 and 3,664.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,986.56 : 17,975.52 = 3,664.80 : x
2. Step 2: Convert to fraction form
   11,986.56/17,975.52 = 3,664.80/x
3. Step 3: Cross multiply
   11,986.56x = 17,975.52 × 3,664.80
4. Step 4: Simplify right side
   11,986.56x = 65,876,685.70
5. Step 5: Solve for x
   x = 65,876,685.70/11,986.56
6. Step 6: Final answer
   x = 5,495.88