Finding the Fourth Proportional to 12,738.40, 17,578.86 and 7,072.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.40 : 17,578.86 = 7,072.94 : x
2. Step 2: Convert to fraction form
   12,738.40/17,578.86 = 7,072.94/x
3. Step 3: Cross multiply
   12,738.40x = 17,578.86 × 7,072.94
4. Step 4: Simplify right side
   12,738.40x = 124,334,222.05
5. Step 5: Solve for x
   x = 124,334,222.05/12,738.40
6. Step 6: Final answer
   x = 9,760.58