Finding the Fourth Proportional to 13,096.91, 18,073.75 and 7,128.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.91 : 18,073.75 = 7,128.57 : x
2. Step 2: Convert to fraction form
   13,096.91/18,073.75 = 7,128.57/x
3. Step 3: Cross multiply
   13,096.91x = 18,073.75 × 7,128.57
4. Step 4: Simplify right side
   13,096.91x = 128,839,992.04
5. Step 5: Solve for x
   x = 128,839,992.04/13,096.91
6. Step 6: Final answer
   x = 9,837.43