Finding the Fourth Proportional to 7,818.40, 10,791.12 and 5,399.16

Step by Step Solution

1. Step 1: Write the proportion equation
   7,818.40 : 10,791.12 = 5,399.16 : x
2. Step 2: Convert to fraction form
   7,818.40/10,791.12 = 5,399.16/x
3. Step 3: Cross multiply
   7,818.40x = 10,791.12 × 5,399.16
4. Step 4: Simplify right side
   7,818.40x = 58,262,983.46
5. Step 5: Solve for x
   x = 58,262,983.46/7,818.40
6. Step 6: Final answer
   x = 7,452.03