Finding the Fourth Proportional to 9,725.76, 13,418.88 and 5,745.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,725.76 : 13,418.88 = 5,745.12 : x
2. Step 2: Convert to fraction form
   9,725.76/13,418.88 = 5,745.12/x
3. Step 3: Cross multiply
   9,725.76x = 13,418.88 × 5,745.12
4. Step 4: Simplify right side
   9,725.76x = 77,093,075.87
5. Step 5: Solve for x
   x = 77,093,075.87/9,725.76
6. Step 6: Final answer
   x = 7,926.69