Finding the Fourth Proportional to 7,765.61, 10,716.50 and 4,228.79

Step by Step Solution

1. Step 1: Write the proportion equation
   7,765.61 : 10,716.50 = 4,228.79 : x
2. Step 2: Convert to fraction form
   7,765.61/10,716.50 = 4,228.79/x
3. Step 3: Cross multiply
   7,765.61x = 10,716.50 × 4,228.79
4. Step 4: Simplify right side
   7,765.61x = 45,317,806.89
5. Step 5: Solve for x
   x = 45,317,806.89/7,765.61
6. Step 6: Final answer
   x = 5,835.70