Finding the Fourth Proportional to 13,096.90, 18,073.16 and 7,128.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.90 : 18,073.16 = 7,128.62 : x
2. Step 2: Convert to fraction form
   13,096.90/18,073.16 = 7,128.62/x
3. Step 3: Cross multiply
   13,096.90x = 18,073.16 × 7,128.62
4. Step 4: Simplify right side
   13,096.90x = 128,836,658.34
5. Step 5: Solve for x
   x = 128,836,658.34/13,096.90
6. Step 6: Final answer
   x = 9,837.19