Finding the Fourth Proportional to 12,760.33, 19,142.79 and 5,259.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,760.33 : 19,142.79 = 5,259.71 : x
2. Step 2: Convert to fraction form
   12,760.33/19,142.79 = 5,259.71/x
3. Step 3: Cross multiply
   12,760.33x = 19,142.79 × 5,259.71
4. Step 4: Simplify right side
   12,760.33x = 100,685,497.69
5. Step 5: Solve for x
   x = 100,685,497.69/12,760.33
6. Step 6: Final answer
   x = 7,890.51