Finding the Fourth Proportional to 23,128.42, 31,917.20 and 12,518.03

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.42 : 31,917.20 = 12,518.03 : x
2. Step 2: Convert to fraction form
   23,128.42/31,917.20 = 12,518.03/x
3. Step 3: Cross multiply
   23,128.42x = 31,917.20 × 12,518.03
4. Step 4: Simplify right side
   23,128.42x = 399,540,467.12
5. Step 5: Solve for x
   x = 399,540,467.12/23,128.42
6. Step 6: Final answer
   x = 17,274.87