Finding the Fourth Proportional to 7,158.78, 10,717.31 and 5,318.06

Step by Step Solution

1. Step 1: Write the proportion equation
   7,158.78 : 10,717.31 = 5,318.06 : x
2. Step 2: Convert to fraction form
   7,158.78/10,717.31 = 5,318.06/x
3. Step 3: Cross multiply
   7,158.78x = 10,717.31 × 5,318.06
4. Step 4: Simplify right side
   7,158.78x = 56,995,257.33
5. Step 5: Solve for x
   x = 56,995,257.33/7,158.78
6. Step 6: Final answer
   x = 7,961.59