Finding the Fourth Proportional to 11,271.55, 15,567.50 and 7,680.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,271.55 : 15,567.50 = 7,680.28 : x
2. Step 2: Convert to fraction form
   11,271.55/15,567.50 = 7,680.28/x
3. Step 3: Cross multiply
   11,271.55x = 15,567.50 × 7,680.28
4. Step 4: Simplify right side
   11,271.55x = 119,562,758.90
5. Step 5: Solve for x
   x = 119,562,758.90/11,271.55
6. Step 6: Final answer
   x = 10,607.48