Finding the Fourth Proportional to 12,719, 17,553.30 and 7,131.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719 : 17,553.30 = 7,131.08 : x
2. Step 2: Convert to fraction form
   12,719/17,553.30 = 7,131.08/x
3. Step 3: Cross multiply
   12,719x = 17,553.30 × 7,131.08
4. Step 4: Simplify right side
   12,719x = 125,173,986.56
5. Step 5: Solve for x
   x = 125,173,986.56/12,719
6. Step 6: Final answer
   x = 9,841.50