Finding the Fourth Proportional to 13,079.48, 18,049.56 and 7,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,079.48 : 18,049.56 = 7,111.31 : x
2. Step 2: Convert to fraction form
   13,079.48/18,049.56 = 7,111.31/x
3. Step 3: Cross multiply
   13,079.48x = 18,049.56 × 7,111.31
4. Step 4: Simplify right side
   13,079.48x = 128,356,016.52
5. Step 5: Solve for x
   x = 128,356,016.52/13,079.48
6. Step 6: Final answer
   x = 9,813.54