Finding the Fourth Proportional to 13,097.06, 18,073.39 and 7,128.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,097.06 : 18,073.39 = 7,128.74 : x
2. Step 2: Convert to fraction form
   13,097.06/18,073.39 = 7,128.74/x
3. Step 3: Cross multiply
   13,097.06x = 18,073.39 × 7,128.74
4. Step 4: Simplify right side
   13,097.06x = 128,840,498.23
5. Step 5: Solve for x
   x = 128,840,498.23/13,097.06
6. Step 6: Final answer
   x = 9,837.36