Finding the Fourth Proportional to 19,857.56, 27,404.82 and 13,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,857.56 : 27,404.82 = 13,131.50 : x
2. Step 2: Convert to fraction form
   19,857.56/27,404.82 = 13,131.50/x
3. Step 3: Cross multiply
   19,857.56x = 27,404.82 × 13,131.50
4. Step 4: Simplify right side
   19,857.56x = 359,866,393.83
5. Step 5: Solve for x
   x = 359,866,393.83/19,857.56
6. Step 6: Final answer
   x = 18,122.39