Finding the Fourth Proportional to 12,910.57, 17,822.01 and 10,931.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.57 : 17,822.01 = 10,931.38 : x
2. Step 2: Convert to fraction form
   12,910.57/17,822.01 = 10,931.38/x
3. Step 3: Cross multiply
   12,910.57x = 17,822.01 × 10,931.38
4. Step 4: Simplify right side
   12,910.57x = 194,819,163.67
5. Step 5: Solve for x
   x = 194,819,163.67/12,910.57
6. Step 6: Final answer
   x = 15,089.90