Finding the Fourth Proportional to 23,129.34, 31,918.50 and 12,519

Step by Step Solution

1. Step 1: Write the proportion equation
   23,129.34 : 31,918.50 = 12,519 : x
2. Step 2: Convert to fraction form
   23,129.34/31,918.50 = 12,519/x
3. Step 3: Cross multiply
   23,129.34x = 31,918.50 × 12,519
4. Step 4: Simplify right side
   23,129.34x = 399,587,701.50
5. Step 5: Solve for x
   x = 399,587,701.50/23,129.34
6. Step 6: Final answer
   x = 17,276.23