Finding the Fourth Proportional to 22,812.10, 31,480.38 and 12,740.71

Step by Step Solution

1. Step 1: Write the proportion equation
   22,812.10 : 31,480.38 = 12,740.71 : x
2. Step 2: Convert to fraction form
   22,812.10/31,480.38 = 12,740.71/x
3. Step 3: Cross multiply
   22,812.10x = 31,480.38 × 12,740.71
4. Step 4: Simplify right side
   22,812.10x = 401,082,392.27
5. Step 5: Solve for x
   x = 401,082,392.27/22,812.10
6. Step 6: Final answer
   x = 17,582.00