Finding the Fourth Proportional to 23,109, 31,890.29 and 12,498.60

Step by Step Solution

1. Step 1: Write the proportion equation
   23,109 : 31,890.29 = 12,498.60 : x
2. Step 2: Convert to fraction form
   23,109/31,890.29 = 12,498.60/x
3. Step 3: Cross multiply
   23,109x = 31,890.29 × 12,498.60
4. Step 4: Simplify right side
   23,109x = 398,583,916.10
5. Step 5: Solve for x
   x = 398,583,916.10/23,109
6. Step 6: Final answer
   x = 17,247.99