Finding the Fourth Proportional to 11,711.59, 16,154.03 and 7,172.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,711.59 : 16,154.03 = 7,172.15 : x
2. Step 2: Convert to fraction form
   11,711.59/16,154.03 = 7,172.15/x
3. Step 3: Cross multiply
   11,711.59x = 16,154.03 × 7,172.15
4. Step 4: Simplify right side
   11,711.59x = 115,859,063.42
5. Step 5: Solve for x
   x = 115,859,063.42/11,711.59
6. Step 6: Final answer
   x = 9,892.69