Finding the Fourth Proportional to 12,723.21, 17,559.21 and 7,345.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,723.21 : 17,559.21 = 7,345.82 : x
2. Step 2: Convert to fraction form
   12,723.21/17,559.21 = 7,345.82/x
3. Step 3: Cross multiply
   12,723.21x = 17,559.21 × 7,345.82
4. Step 4: Simplify right side
   12,723.21x = 128,986,796.00
5. Step 5: Solve for x
   x = 128,986,796.00/12,723.21
6. Step 6: Final answer
   x = 10,137.91