Finding the Fourth Proportional to 23,059.56, 31,819.82 and 12,986.40

Step by Step Solution

1. Step 1: Write the proportion equation
   23,059.56 : 31,819.82 = 12,986.40 : x
2. Step 2: Convert to fraction form
   23,059.56/31,819.82 = 12,986.40/x
3. Step 3: Cross multiply
   23,059.56x = 31,819.82 × 12,986.40
4. Step 4: Simplify right side
   23,059.56x = 413,224,910.45
5. Step 5: Solve for x
   x = 413,224,910.45/23,059.56
6. Step 6: Final answer
   x = 17,919.90