Finding the Fourth Proportional to 13,096.54, 18,072.21 and 7,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.54 : 18,072.21 = 7,128.08 : x
2. Step 2: Convert to fraction form
   13,096.54/18,072.21 = 7,128.08/x
3. Step 3: Cross multiply
   13,096.54x = 18,072.21 × 7,128.08
4. Step 4: Simplify right side
   13,096.54x = 128,820,068.30
5. Step 5: Solve for x
   x = 128,820,068.30/13,096.54
6. Step 6: Final answer
   x = 9,836.19