Finding the Fourth Proportional to 9,404.27, 13,002.21 and 8,991.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.27 : 13,002.21 = 8,991.17 : x
2. Step 2: Convert to fraction form
   9,404.27/13,002.21 = 8,991.17/x
3. Step 3: Cross multiply
   9,404.27x = 13,002.21 × 8,991.17
4. Step 4: Simplify right side
   9,404.27x = 116,905,080.49
5. Step 5: Solve for x
   x = 116,905,080.49/9,404.27
6. Step 6: Final answer
   x = 12,431.06