Finding the Fourth Proportional to 19,086.22, 28,644.72 and 13,159.45

Step by Step Solution

1. Step 1: Write the proportion equation
   19,086.22 : 28,644.72 = 13,159.45 : x
2. Step 2: Convert to fraction form
   19,086.22/28,644.72 = 13,159.45/x
3. Step 3: Cross multiply
   19,086.22x = 28,644.72 × 13,159.45
4. Step 4: Simplify right side
   19,086.22x = 376,948,760.60
5. Step 5: Solve for x
   x = 376,948,760.60/19,086.22
6. Step 6: Final answer
   x = 19,749.79