Finding the Fourth Proportional to 13,096.57, 18,072.72 and 7,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.57 : 18,072.72 = 7,128.25 : x
2. Step 2: Convert to fraction form
   13,096.57/18,072.72 = 7,128.25/x
3. Step 3: Cross multiply
   13,096.57x = 18,072.72 × 7,128.25
4. Step 4: Simplify right side
   13,096.57x = 128,826,866.34
5. Step 5: Solve for x
   x = 128,826,866.34/13,096.57
6. Step 6: Final answer
   x = 9,836.69