Finding the Fourth Proportional to 12,870.50, 17,761.17 and 7,281.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.50 : 17,761.17 = 7,281.50 : x
2. Step 2: Convert to fraction form
   12,870.50/17,761.17 = 7,281.50/x
3. Step 3: Cross multiply
   12,870.50x = 17,761.17 × 7,281.50
4. Step 4: Simplify right side
   12,870.50x = 129,327,959.36
5. Step 5: Solve for x
   x = 129,327,959.36/12,870.50
6. Step 6: Final answer
   x = 10,048.40