Finding the Fourth Proportional to 13,096.32, 18,072.60 and 7,128

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.32 : 18,072.60 = 7,128 : x
2. Step 2: Convert to fraction form
   13,096.32/18,072.60 = 7,128/x
3. Step 3: Cross multiply
   13,096.32x = 18,072.60 × 7,128
4. Step 4: Simplify right side
   13,096.32x = 128,821,492.80
5. Step 5: Solve for x
   x = 128,821,492.80/13,096.32
6. Step 6: Final answer
   x = 9,836.46