Finding the Fourth Proportional to 12,870, 17,760.96 and 7,281.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870 : 17,760.96 = 7,281.36 : x
2. Step 2: Convert to fraction form
   12,870/17,760.96 = 7,281.36/x
3. Step 3: Cross multiply
   12,870x = 17,760.96 × 7,281.36
4. Step 4: Simplify right side
   12,870x = 129,323,943.71
5. Step 5: Solve for x
   x = 129,323,943.71/12,870
6. Step 6: Final answer
   x = 10,048.48