Finding the Fourth Proportional to 13,096.48, 18,072.89 and 7,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.48 : 18,072.89 = 7,128.28 : x
2. Step 2: Convert to fraction form
   13,096.48/18,072.89 = 7,128.28/x
3. Step 3: Cross multiply
   13,096.48x = 18,072.89 × 7,128.28
4. Step 4: Simplify right side
   13,096.48x = 128,828,620.33
5. Step 5: Solve for x
   x = 128,828,620.33/13,096.48
6. Step 6: Final answer
   x = 9,836.89