Finding the Fourth Proportional to 12,720.96, 17,554.86 and 7,131.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.96 : 17,554.86 = 7,131.96 : x
2. Step 2: Convert to fraction form
   12,720.96/17,554.86 = 7,131.96/x
3. Step 3: Cross multiply
   12,720.96x = 17,554.86 × 7,131.96
4. Step 4: Simplify right side
   12,720.96x = 125,200,559.33
5. Step 5: Solve for x
   x = 125,200,559.33/12,720.96
6. Step 6: Final answer
   x = 9,842.07