Finding the Fourth Proportional to 12,720.40, 17,554.20 and 7,055.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.40 : 17,554.20 = 7,055.67 : x
2. Step 2: Convert to fraction form
   12,720.40/17,554.20 = 7,055.67/x
3. Step 3: Cross multiply
   12,720.40x = 17,554.20 × 7,055.67
4. Step 4: Simplify right side
   12,720.40x = 123,856,642.31
5. Step 5: Solve for x
   x = 123,856,642.31/12,720.40
6. Step 6: Final answer
   x = 9,736.85