Finding the Fourth Proportional to 16,991.34, 25,487.94 and 7,131

Step by Step Solution

1. Step 1: Write the proportion equation
   16,991.34 : 25,487.94 = 7,131 : x
2. Step 2: Convert to fraction form
   16,991.34/25,487.94 = 7,131/x
3. Step 3: Cross multiply
   16,991.34x = 25,487.94 × 7,131
4. Step 4: Simplify right side
   16,991.34x = 181,754,500.14
5. Step 5: Solve for x
   x = 181,754,500.14/16,991.34
6. Step 6: Final answer
   x = 10,696.89