Finding the Fourth Proportional to 7,180.78, 10,778.43 and 5,103.13

Step by Step Solution

1. Step 1: Write the proportion equation
   7,180.78 : 10,778.43 = 5,103.13 : x
2. Step 2: Convert to fraction form
   7,180.78/10,778.43 = 5,103.13/x
3. Step 3: Cross multiply
   7,180.78x = 10,778.43 × 5,103.13
4. Step 4: Simplify right side
   7,180.78x = 55,003,729.49
5. Step 5: Solve for x
   x = 55,003,729.49/7,180.78
6. Step 6: Final answer
   x = 7,659.85