Finding the Fourth Proportional to 11,580.72, 17,379 and 8,664.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,580.72 : 17,379 = 8,664.72 : x
2. Step 2: Convert to fraction form
   11,580.72/17,379 = 8,664.72/x
3. Step 3: Cross multiply
   11,580.72x = 17,379 × 8,664.72
4. Step 4: Simplify right side
   11,580.72x = 150,584,168.88
5. Step 5: Solve for x
   x = 150,584,168.88/11,580.72
6. Step 6: Final answer
   x = 13,003.01