Finding the Fourth Proportional to 19,847.65, 27,375.31 and 13,139.03

Step by Step Solution

1. Step 1: Write the proportion equation
   19,847.65 : 27,375.31 = 13,139.03 : x
2. Step 2: Convert to fraction form
   19,847.65/27,375.31 = 13,139.03/x
3. Step 3: Cross multiply
   19,847.65x = 27,375.31 × 13,139.03
4. Step 4: Simplify right side
   19,847.65x = 359,685,019.35
5. Step 5: Solve for x
   x = 359,685,019.35/19,847.65
6. Step 6: Final answer
   x = 18,122.30