Finding the Fourth Proportional to 12,721.40, 17,554.68 and 7,055.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.40 : 17,554.68 = 7,055.94 : x
2. Step 2: Convert to fraction form
   12,721.40/17,554.68 = 7,055.94/x
3. Step 3: Cross multiply
   12,721.40x = 17,554.68 × 7,055.94
4. Step 4: Simplify right side
   12,721.40x = 123,864,768.80
5. Step 5: Solve for x
   x = 123,864,768.80/12,721.40
6. Step 6: Final answer
   x = 9,736.72