Finding the Fourth Proportional to 13,096.66, 18,072.82 and 7,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.66 : 18,072.82 = 7,128.20 : x
2. Step 2: Convert to fraction form
   13,096.66/18,072.82 = 7,128.20/x
3. Step 3: Cross multiply
   13,096.66x = 18,072.82 × 7,128.20
4. Step 4: Simplify right side
   13,096.66x = 128,826,615.25
5. Step 5: Solve for x
   x = 128,826,615.25/13,096.66
6. Step 6: Final answer
   x = 9,836.60