Finding the Fourth Proportional to 23,057.62, 31,820.08 and 12,986.42

Step by Step Solution

1. Step 1: Write the proportion equation
   23,057.62 : 31,820.08 = 12,986.42 : x
2. Step 2: Convert to fraction form
   23,057.62/31,820.08 = 12,986.42/x
3. Step 3: Cross multiply
   23,057.62x = 31,820.08 × 12,986.42
4. Step 4: Simplify right side
   23,057.62x = 413,228,923.31
5. Step 5: Solve for x
   x = 413,228,923.31/23,057.62
6. Step 6: Final answer
   x = 17,921.58