Finding the Fourth Proportional to 7,665.48, 10,618.39 and 7,509.96

Step by Step Solution

1. Step 1: Write the proportion equation
   7,665.48 : 10,618.39 = 7,509.96 : x
2. Step 2: Convert to fraction form
   7,665.48/10,618.39 = 7,509.96/x
3. Step 3: Cross multiply
   7,665.48x = 10,618.39 × 7,509.96
4. Step 4: Simplify right side
   7,665.48x = 79,743,684.16
5. Step 5: Solve for x
   x = 79,743,684.16/7,665.48
6. Step 6: Final answer
   x = 10,402.96