Finding the Fourth Proportional to 9,171.72, 13,689.72 and 8,011.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,171.72 : 13,689.72 = 8,011.26 : x
2. Step 2: Convert to fraction form
   9,171.72/13,689.72 = 8,011.26/x
3. Step 3: Cross multiply
   9,171.72x = 13,689.72 × 8,011.26
4. Step 4: Simplify right side
   9,171.72x = 109,671,906.25
5. Step 5: Solve for x
   x = 109,671,906.25/9,171.72
6. Step 6: Final answer
   x = 11,957.62