Finding the Fourth Proportional to 23,147.60, 31,941.40 and 12,936.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,147.60 : 31,941.40 = 12,936.72 : x
2. Step 2: Convert to fraction form
   23,147.60/31,941.40 = 12,936.72/x
3. Step 3: Cross multiply
   23,147.60x = 31,941.40 × 12,936.72
4. Step 4: Simplify right side
   23,147.60x = 413,216,948.21
5. Step 5: Solve for x
   x = 413,216,948.21/23,147.60
6. Step 6: Final answer
   x = 17,851.39