Finding the Fourth Proportional to 13,096.62, 18,072.90 and 7,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.62 : 18,072.90 = 7,128.18 : x
2. Step 2: Convert to fraction form
   13,096.62/18,072.90 = 7,128.18/x
3. Step 3: Cross multiply
   13,096.62x = 18,072.90 × 7,128.18
4. Step 4: Simplify right side
   13,096.62x = 128,826,884.32
5. Step 5: Solve for x
   x = 128,826,884.32/13,096.62
6. Step 6: Final answer
   x = 9,836.65