Finding the Fourth Proportional to 11,300.76, 15,607.82 and 7,709.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,300.76 : 15,607.82 = 7,709.55 : x
2. Step 2: Convert to fraction form
   11,300.76/15,607.82 = 7,709.55/x
3. Step 3: Cross multiply
   11,300.76x = 15,607.82 × 7,709.55
4. Step 4: Simplify right side
   11,300.76x = 120,329,273.85
5. Step 5: Solve for x
   x = 120,329,273.85/11,300.76
6. Step 6: Final answer
   x = 10,647.89