Finding the Fourth Proportional to 13,079.57, 18,049.55 and 7,111.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,079.57 : 18,049.55 = 7,111.18 : x
2. Step 2: Convert to fraction form
   13,079.57/18,049.55 = 7,111.18/x
3. Step 3: Cross multiply
   13,079.57x = 18,049.55 × 7,111.18
4. Step 4: Simplify right side
   13,079.57x = 128,353,585.98
5. Step 5: Solve for x
   x = 128,353,585.98/13,079.57
6. Step 6: Final answer
   x = 9,813.29