Finding the Fourth Proportional to 23,171.47, 31,976.85 and 12,561.28

Step by Step Solution

1. Step 1: Write the proportion equation
   23,171.47 : 31,976.85 = 12,561.28 : x
2. Step 2: Convert to fraction form
   23,171.47/31,976.85 = 12,561.28/x
3. Step 3: Cross multiply
   23,171.47x = 31,976.85 × 12,561.28
4. Step 4: Simplify right side
   23,171.47x = 401,670,166.37
5. Step 5: Solve for x
   x = 401,670,166.37/23,171.47
6. Step 6: Final answer
   x = 17,334.69