Finding the Fourth Proportional to 11,579.48, 17,359.46 and 7,871.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,579.48 : 17,359.46 = 7,871.30 : x
2. Step 2: Convert to fraction form
   11,579.48/17,359.46 = 7,871.30/x
3. Step 3: Cross multiply
   11,579.48x = 17,359.46 × 7,871.30
4. Step 4: Simplify right side
   11,579.48x = 136,641,517.50
5. Step 5: Solve for x
   x = 136,641,517.50/11,579.48
6. Step 6: Final answer
   x = 11,800.32