Finding the Fourth Proportional to 12,469.85, 17,196.38 and 8,390.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,469.85 : 17,196.38 = 8,390.84 : x
2. Step 2: Convert to fraction form
   12,469.85/17,196.38 = 8,390.84/x
3. Step 3: Cross multiply
   12,469.85x = 17,196.38 × 8,390.84
4. Step 4: Simplify right side
   12,469.85x = 144,291,945.22
5. Step 5: Solve for x
   x = 144,291,945.22/12,469.85
6. Step 6: Final answer
   x = 11,571.27