Finding the Fourth Proportional to 11,401.81, 17,111.18 and 8,631.97

Step by Step Solution

1. Step 1: Write the proportion equation
   11,401.81 : 17,111.18 = 8,631.97 : x
2. Step 2: Convert to fraction form
   11,401.81/17,111.18 = 8,631.97/x
3. Step 3: Cross multiply
   11,401.81x = 17,111.18 × 8,631.97
4. Step 4: Simplify right side
   11,401.81x = 147,703,192.42
5. Step 5: Solve for x
   x = 147,703,192.42/11,401.81
6. Step 6: Final answer
   x = 12,954.36