Finding the Fourth Proportional to 7,760.76, 10,709.72 and 4,223.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,760.76 : 10,709.72 = 4,223.90 : x
2. Step 2: Convert to fraction form
   7,760.76/10,709.72 = 4,223.90/x
3. Step 3: Cross multiply
   7,760.76x = 10,709.72 × 4,223.90
4. Step 4: Simplify right side
   7,760.76x = 45,236,786.31
5. Step 5: Solve for x
   x = 45,236,786.31/7,760.76
6. Step 6: Final answer
   x = 5,828.91