Finding the Fourth Proportional to 23,109, 31,890.48 and 12,498.68

Step by Step Solution

1. Step 1: Write the proportion equation
   23,109 : 31,890.48 = 12,498.68 : x
2. Step 2: Convert to fraction form
   23,109/31,890.48 = 12,498.68/x
3. Step 3: Cross multiply
   23,109x = 31,890.48 × 12,498.68
4. Step 4: Simplify right side
   23,109x = 398,588,904.57
5. Step 5: Solve for x
   x = 398,588,904.57/23,109
6. Step 6: Final answer
   x = 17,248.21