Finding the Fourth Proportional to 9,278.69, 12,805.67 and 5,300.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,278.69 : 12,805.67 = 5,300.38 : x
2. Step 2: Convert to fraction form
   9,278.69/12,805.67 = 5,300.38/x
3. Step 3: Cross multiply
   9,278.69x = 12,805.67 × 5,300.38
4. Step 4: Simplify right side
   9,278.69x = 67,874,917.15
5. Step 5: Solve for x
   x = 67,874,917.15/9,278.69
6. Step 6: Final answer
   x = 7,315.14