Finding the Fourth Proportional to 6,780.05, 10,131.21 and 5,168.29

Step by Step Solution

1. Step 1: Write the proportion equation
   6,780.05 : 10,131.21 = 5,168.29 : x
2. Step 2: Convert to fraction form
   6,780.05/10,131.21 = 5,168.29/x
3. Step 3: Cross multiply
   6,780.05x = 10,131.21 × 5,168.29
4. Step 4: Simplify right side
   6,780.05x = 52,361,025.38
5. Step 5: Solve for x
   x = 52,361,025.38/6,780.05
6. Step 6: Final answer
   x = 7,722.81