Finding the Fourth Proportional to 12,689, 17,506.56 and 7,379.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689 : 17,506.56 = 7,379.46 : x
2. Step 2: Convert to fraction form
   12,689/17,506.56 = 7,379.46/x
3. Step 3: Cross multiply
   12,689x = 17,506.56 × 7,379.46
4. Step 4: Simplify right side
   12,689x = 129,188,959.26
5. Step 5: Solve for x
   x = 129,188,959.26/12,689
6. Step 6: Final answer
   x = 10,181.18