Finding the Fourth Proportional to 27,142.48, 40,719.57 and 8,422.12

Step by Step Solution

1. Step 1: Write the proportion equation
   27,142.48 : 40,719.57 = 8,422.12 : x
2. Step 2: Convert to fraction form
   27,142.48/40,719.57 = 8,422.12/x
3. Step 3: Cross multiply
   27,142.48x = 40,719.57 × 8,422.12
4. Step 4: Simplify right side
   27,142.48x = 342,945,104.89
5. Step 5: Solve for x
   x = 342,945,104.89/27,142.48
6. Step 6: Final answer
   x = 12,635.00