Finding the Fourth Proportional to 22,812.76, 31,479.82 and 12,740.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,812.76 : 31,479.82 = 12,740.42 : x
2. Step 2: Convert to fraction form
   22,812.76/31,479.82 = 12,740.42/x
3. Step 3: Cross multiply
   22,812.76x = 31,479.82 × 12,740.42
4. Step 4: Simplify right side
   22,812.76x = 401,066,128.32
5. Step 5: Solve for x
   x = 401,066,128.32/22,812.76
6. Step 6: Final answer
   x = 17,580.78