Finding the Fourth Proportional to 13,097.76, 18,074.89 and 7,129.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,097.76 : 18,074.89 = 7,129.41 : x
2. Step 2: Convert to fraction form
   13,097.76/18,074.89 = 7,129.41/x
3. Step 3: Cross multiply
   13,097.76x = 18,074.89 × 7,129.41
4. Step 4: Simplify right side
   13,097.76x = 128,863,301.51
5. Step 5: Solve for x
   x = 128,863,301.51/13,097.76
6. Step 6: Final answer
   x = 9,838.58