Finding the Fourth Proportional to 7,765.78, 10,715.18 and 7,499.08

Step by Step Solution

1. Step 1: Write the proportion equation
   7,765.78 : 10,715.18 = 7,499.08 : x
2. Step 2: Convert to fraction form
   7,765.78/10,715.18 = 7,499.08/x
3. Step 3: Cross multiply
   7,765.78x = 10,715.18 × 7,499.08
4. Step 4: Simplify right side
   7,765.78x = 80,353,992.03
5. Step 5: Solve for x
   x = 80,353,992.03/7,765.78
6. Step 6: Final answer
   x = 10,347.19