Finding the Fourth Proportional to 9,320.49, 12,855.54 and 5,340.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.49 : 12,855.54 = 5,340.15 : x
2. Step 2: Convert to fraction form
   9,320.49/12,855.54 = 5,340.15/x
3. Step 3: Cross multiply
   9,320.49x = 12,855.54 × 5,340.15
4. Step 4: Simplify right side
   9,320.49x = 68,650,511.93
5. Step 5: Solve for x
   x = 68,650,511.93/9,320.49
6. Step 6: Final answer
   x = 7,365.55