Finding the Fourth Proportional to 6,940.72, 10,398.12 and 5,398.48

Step by Step Solution

1. Step 1: Write the proportion equation
   6,940.72 : 10,398.12 = 5,398.48 : x
2. Step 2: Convert to fraction form
   6,940.72/10,398.12 = 5,398.48/x
3. Step 3: Cross multiply
   6,940.72x = 10,398.12 × 5,398.48
4. Step 4: Simplify right side
   6,940.72x = 56,134,042.86
5. Step 5: Solve for x
   x = 56,134,042.86/6,940.72
6. Step 6: Final answer
   x = 8,087.64