Finding the Fourth Proportional to 7,768.28, 10,719.60 and 5,415.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,768.28 : 10,719.60 = 5,415.50 : x
2. Step 2: Convert to fraction form
   7,768.28/10,719.60 = 5,415.50/x
3. Step 3: Cross multiply
   7,768.28x = 10,719.60 × 5,415.50
4. Step 4: Simplify right side
   7,768.28x = 58,051,993.80
5. Step 5: Solve for x
   x = 58,051,993.80/7,768.28
6. Step 6: Final answer
   x = 7,472.95