Finding the Fourth Proportional to 9,377.20, 12,943.02 and 5,398.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.20 : 12,943.02 = 5,398.78 : x
2. Step 2: Convert to fraction form
   9,377.20/12,943.02 = 5,398.78/x
3. Step 3: Cross multiply
   9,377.20x = 12,943.02 × 5,398.78
4. Step 4: Simplify right side
   9,377.20x = 69,876,517.52
5. Step 5: Solve for x
   x = 69,876,517.52/9,377.20
6. Step 6: Final answer
   x = 7,451.75