Finding the Fourth Proportional to 7,756.72, 11,619.72 and 3,655.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,756.72 : 11,619.72 = 3,655.60 : x
2. Step 2: Convert to fraction form
   7,756.72/11,619.72 = 3,655.60/x
3. Step 3: Cross multiply
   7,756.72x = 11,619.72 × 3,655.60
4. Step 4: Simplify right side
   7,756.72x = 42,477,048.43
5. Step 5: Solve for x
   x = 42,477,048.43/7,756.72
6. Step 6: Final answer
   x = 5,476.16