Finding the Fourth Proportional to 22,812.72, 31,480.91 and 12,740.87

Step by Step Solution

1. Step 1: Write the proportion equation
   22,812.72 : 31,480.91 = 12,740.87 : x
2. Step 2: Convert to fraction form
   22,812.72/31,480.91 = 12,740.87/x
3. Step 3: Cross multiply
   22,812.72x = 31,480.91 × 12,740.87
4. Step 4: Simplify right side
   22,812.72x = 401,093,960.68
5. Step 5: Solve for x
   x = 401,093,960.68/22,812.72
6. Step 6: Final answer
   x = 17,582.03