Finding the Fourth Proportional to 12,869.84, 17,760.72 and 7,280.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,869.84 : 17,760.72 = 7,280.96 : x
2. Step 2: Convert to fraction form
   12,869.84/17,760.72 = 7,280.96/x
3. Step 3: Cross multiply
   12,869.84x = 17,760.72 × 7,280.96
4. Step 4: Simplify right side
   12,869.84x = 129,315,091.89
5. Step 5: Solve for x
   x = 129,315,091.89/12,869.84
6. Step 6: Final answer
   x = 10,047.92