Finding the Fourth Proportional to 13,097.37, 18,073.88 and 7,128.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,097.37 : 18,073.88 = 7,128.91 : x
2. Step 2: Convert to fraction form
   13,097.37/18,073.88 = 7,128.91/x
3. Step 3: Cross multiply
   13,097.37x = 18,073.88 × 7,128.91
4. Step 4: Simplify right side
   13,097.37x = 128,847,063.87
5. Step 5: Solve for x
   x = 128,847,063.87/13,097.37
6. Step 6: Final answer
   x = 9,837.63