Finding the Fourth Proportional to 23,121.50, 31,907.67 and 13,185.50

Step by Step Solution

1. Step 1: Write the proportion equation
   23,121.50 : 31,907.67 = 13,185.50 : x
2. Step 2: Convert to fraction form
   23,121.50/31,907.67 = 13,185.50/x
3. Step 3: Cross multiply
   23,121.50x = 31,907.67 × 13,185.50
4. Step 4: Simplify right side
   23,121.50x = 420,718,582.79
5. Step 5: Solve for x
   x = 420,718,582.79/23,121.50
6. Step 6: Final answer
   x = 18,195.99