Finding the Fourth Proportional to 13,096.80, 18,073.80 and 7,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.80 : 18,073.80 = 7,128.59 : x
2. Step 2: Convert to fraction form
   13,096.80/18,073.80 = 7,128.59/x
3. Step 3: Cross multiply
   13,096.80x = 18,073.80 × 7,128.59
4. Step 4: Simplify right side
   13,096.80x = 128,840,619.57
5. Step 5: Solve for x
   x = 128,840,619.57/13,096.80
6. Step 6: Final answer
   x = 9,837.56