Finding the Fourth Proportional to 13,096.98, 18,073.58 and 7,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,096.98 : 18,073.58 = 7,128.78 : x
2. Step 2: Convert to fraction form
   13,096.98/18,073.58 = 7,128.78/x
3. Step 3: Cross multiply
   13,096.98x = 18,073.58 × 7,128.78
4. Step 4: Simplify right side
   13,096.98x = 128,842,575.63
5. Step 5: Solve for x
   x = 128,842,575.63/13,096.98
6. Step 6: Final answer
   x = 9,837.58