Finding the Fourth Proportional to 12,391.59, 17,076.78 and 12,163.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.59 : 17,076.78 = 12,163.86 : x
2. Step 2: Convert to fraction form
   12,391.59/17,076.78 = 12,163.86/x
3. Step 3: Cross multiply
   12,391.59x = 17,076.78 × 12,163.86
4. Step 4: Simplify right side
   12,391.59x = 207,719,561.17
5. Step 5: Solve for x
   x = 207,719,561.17/12,391.59
6. Step 6: Final answer
   x = 16,762.95